Title: The Binocular Handbook: Function, Performance and Evaluation of Binoculars.
Foreword by Neil English, author of Choosing & Using Binoculars
Publisher: Springer Nature
Author: Holger Merlitz
ISBN: 978-3031444074
218 Pages
Price UK: £39.99(Hardback)
It was with a great sense of anticipation that I finally got my hard-back copy of Holger Merlitz’s new book, freshly and expertly translated into the English language. Anyone who has expressed even a cursory interest in binoculars will be familiar with Holger’s accumulated writings on his website(http://holgermerlitz.de), where he has built up a formidable portfolio of work covering all aspects of binocular optics, reviews and theoretical speculations. His new book, The Binocular Handbook: Function: Performance and Evaluation of Binoculars, represents the culmination of many years of work.
Holger presents a full treatise on binocular optics in this book, covering everything from the design and execution of theoretical optics and their applications to building binoculars, a detailed overview of how the eye-brain interfaces with the binocular before launching into some fascinating chapters covering the testing and evaluation of binoculars during field use. In total, 9 chapters arranged in 3 distinct parts, walk the reader through pretty much everything you need to know about the fascinating world of binocular optics.
Instead of exhaustively covering the material, I would like to highlight just a few interesting topics covered in the book. I was most impressed with Holger’s use of an aeroplane’s ride from the North Pole round the world as a way of explaining why phase coatings are needed in roof prism binoculars. I also enjoyed his inclusion of discussions on unusual, cemented prism formats, such as the Uppendahl and the Perger (page 51-54) arrangements, the latter of which doesn’t require a phase correction coating and is used in the design of the third-generation Leica Geovid. Holger believes there are no binoculars containing Uppendahl prisms, but I have heard it on good authority that the little Leica Ultravid 8x and 10 x 25 may still be using such prisms.
I found section 4.8 to be particularly amusing when Merlitz discusses sealing and gas purging. The use of the noble gas, argon, in particular, has been touted as being superior to molecular nitrogen owing to its greater molar mass. But as Holger astutely points out on page 97, the very low ambient concentration of argon in air(less than 1 per cent) would create a powerful concentration gradient causing the argon to diffuse out faster than if it were filled with nitrogen under the same circumstances. But it’s worse than that: a binocular filled with argon will cause nitrogen to diffuse inward and increase the pressure enough to eventually damage the seals! It neatly explains why all the big European binocular manufacturers have stuck with nitrogen purging.
Chapter 5 is written by Gerhard Eller, a fellow binocular enthusiast and engineering veteran, who describes the construction of a fascinating 12 x 62mm binocular using twin Leica Apo objectives and Porro II prisms serving up an impressive field of view of 113m@1000m.
The book has full colour illustrations.
The discussion on depth perception in chapter 7 and 8 proved to be fascinating entries, especially since I’ve cultivated a particularly strong fondness for compact Porro prism binoculars over their roof prism counterparts. Merlitz discusses the Japanese made RISO-1 7 x 40 instrument which were employed by the US navy during the Korean War. Indeed, he further informs us that specialised stereoscopic binoculars used in precision range finding measurements had enormous separations in their objective lenses of the order of several metres! That said, while the enhanced stereoscopic effects of Porro prism binoculars are greatly appreciated by yours truly, Holger also discusses some disadvantages of this design, such as inferior close focus performance and an optical illusion called the ‘cardboard effect,’ which was previously unknown to me.
The human eye takes centre stage in the final few chapters. With its 3-megapixel colour camera(cones) and 120 megapixel light detectors(rods), it can respond to changing ambient light levels and even alter the spectral response of the human eye. I’ve always wondered why, for example, many older glasses I’ve viewed through have a yellow tint. In discussing the differences between regular BaK4 and BK7 glass versus their HT equivalents, for example, companies like Zeiss have been able to increase the transmittance at blue wavelengths which helps in low light observations when the human eye becomes more responsive to shorter wavelengths (so called scotopic vision).
Sections 8.2 through 8.4 discuss the interesting topic of binocular efficiency and dim target detection as well as the factors – magnification, aperture, exit pupil and eye pupil size – that determine the outcomes in broad daylight, twilight and under darkness. Magnification alone determines efficiency in daylight, but the situation becomes far more complicated during twilight and full darkness, enabling binocular enthusiasts to experimentally determine the relative importance of these factors in target resolution and detection. Indeed, I’m currently busy comparing and contrasting my two main binoculars – the 8 x 30 and 10 x 35 Nikon EII – with their similar light transmission and exit pupil size – under twilight and true darkness based on Holger’s analysis, to determine if these predictions are validated.
Section 8.7 offers an excellent overview of atmospheric scattering and I really like how the author brings some basic physics such as Rayleigh scattering into the mix. Later in chapter 9, he discusses colour bias in binocular images, explaining why many binoculars having a so-called warm tone exhibit better contrast by (Rayleigh)scattering shorter wavelengths of visible light. On the contrary, he also explains why instruments delivering a cool colour tone are often better for low light work, when the eye becomes increasingly sensitive to shorter wavebands.
These are but a few invaluable nuggets of information presented in this book. The reader will note that much of this surmising is not just based in optical theory but derives from the rich storehouse of practical experience with many fine binoculars he has amassed over the decades. In short, The Binocular Handbook will prove invaluable to keen binocular enthusiasts eager to determine the best instruments to use in their arsenal, with the author gently encouraging active experimentation under real life conditions. Like most good books, it raises more interesting questions than it answers, but rest assured, there is enough content in this timely volume that will keep you thinking and looking for years to come.
Accessories: Padded neck strap, rubber rain guard and objective covers, instruction manual, soft padded case
Price: US $84.99
Ever since its founding in 2009, Svbony has been delighting the astronomy and sports optics community with an expanding range of high-quality products offered at very affordable prices. SVBONY is an acronym which stands for Saturn(S), Venus(V), Birding(B), Optics(O), Nature(N), Youth(Y). I was first introduced to the company a few short years ago when I stumbled on their excellent SV202 ED roof prism binoculars, which have since gone from strength to strength and are now being enjoyed by an army of nature enthusiasts the world over. Not long before this time, consumers were left with very little option to shell out significantly more money for products that often left a lot to be desired quality-wise. Be sure to check out the most recent reviews of these binoculars. Since discovering the SV202s, I have also enjoyed some of their excellent spotting scopes, and regularly use some of their high-quality zoom eyepieces, like the SV191, which I’ve begun to employ extensively this season to observe Jupiter.
The impressive SV 191 7.2-21.6mm zoom eyepiece.
As a dedicated fan of Porro prism binoculars, I’ve steadily come to realise their exceptional value for money owing to great advances in technology, as well as their much simpler design compared with high-performance roof prism binoculars. Truth be told, it takes a lot of knowledge and technology to create roof prism binoculars that can even begin to approach the quality of a traditional, well-made Porro prism design. What’s more, many of the conventional objections purists have laid against the humble Porro prism binocular have now been satisfactorily addressed, including advances in anti-refection coating technology, water- and fog-proofing, and the introduction of modern twist-up eyecups with much better eye relief to accommodate eye glass wearers. In addition, advances in material science also means that good Porro prism binoculars can now be manufactured with lower mass chassis, allowing them to be carried longer in the field.
It was these considerations, as well as my own experiences with several budget-priced Porro prism models that led me to appraise one of Svbony’s newest products, the SA204 10 x 50, a traditional Porro prism binocular. Having ordered several products directly from their online store, I decided to purchase this instrument directly from Svbony too, since they’re currently not available from Amazon UK.
First Impressions
The Svbony SA204 10 x 50 binocular.
The SA204 10 x 50 package took about two weeks to arrive from the Far East to my home. As usual with Svbony, I was extremely impressed with the attention to detail in how it was packaged during its long trip to the UK. The instrument arrived double boxed inside some bubble wrap to ensure that nothing moved out of place during transit. All the accessories were also neatly packed away, including the ocular and objective covers, a carrying strap, lens cleaning cloth, a well-written instruction manual and a decent soft padded carry case. Inspecting the binocular, my first impressions were very favourable. The instrument is covered in a high-quality textured rubber substrate, ribbed at the sides for extra grip. The twist-up eyecups moved smoothly and were easy to adjust, keeping their individual positions firmly when clicked into place. Two intermediate positions are available between fully retracted and fully extended, so plenty of options for those who like to experiment.
Belly side up.
The aluminium central hinge is nicely tensioned, allowing you to easily adjust it to your preferred IPD. Once there, it stays rigidly in place. The rubber-covered central focus wheel has deep ridges to afford extra grip. Turning is very smooth with no free play. It ‘s quite stiff though, a consequence I suppose of the instrument being properly sealed and nitrogen purged. The focuser moves the eyepiece assembly up and down with no annoying wobbles I’ve seen in other instruments in this price class. 0.8 turns anticlockwise takes you from closest focus to jut beyond infinity. Eye relief is very generous. I was easily able to engage with the entire field using my varifocals, although I don’t wear spectacles when glassing under normal circumstances.
The dioptre adjustment is made using a small lever under the right eyepiece that rotates either clockwise or counter-clockwise, and I was easily able to find my optimal position. Once set in place, it stays there. I would say it’s very nicely engineered.
The large ocular lenses and twist-up eyepieces are easy to engage with.
The large ocular lenses have nice green multi-coatings and the objectives are decently recessed as all good binoculars ought to be. The objective coatings appear to be significantly more subdued to those applied to the ocular eyepieces and I detected a faint reflection off one of the interior lenses possibly indicative of one surface being singly coated. The rain guard and tethered ocular covers are quite basic but do an adequate job protecting the lenes from rain and dust.
The 50mm objectives have good coatings although there appears to be one surface that may be singly coated based on its appearance in daylight.
The instrument feels really nice in the hand with plenty of wiggle room to engage with my medium-sized mitts, making it easy to hold the instrument firmly. I was pleasantly surprised by the weight of the instrument without the strap and lens covers. Although the specs claim 925g, my SA204 tipped the scales at just 875g or 50 g less than advertised! All in all, I came away with the impression that this was indeed a nicely appointed binocular, significantly better built than other 10 x 50 Porros I’ve tested in the past, including the Opticron Adventuer T WP and the Nikon Aculon.
Optics
My optical testing began by measuring the effective aperture of the instrument by directing my iPhone 11 torch into one of the eyepieces and measuring the size of the resulting circular shaft of light emerging on the other side of the objectives. By tracing a circle of diameter 50mm, I was able to show that the circular light shaft fitted snugly into the circle indicating that the SA204 was operating at its full aperture.
The SA204 10 x 50 operates at its full aperture.
In the next test, I examined how well the binocular handled a beam of bright light. Turning on a sodium street lamp after dark, I was relieved to see that only a few minor internal reflections were seen that were largely non-injurious to the image. There was no diffused light around the light ether. Consulting my notebooks, I reported a little more internal reflections for both the Nikon Aculon and Action EX Porros(both of which retailing for considerably more than the SA204) I reviewed some time back and about the same as I recorded with two models of Opticron Adventurer T, but not quite as good as that seen in the significantly more expensive Opticron Imagic TGA WP(a £200 value).
Looking at the exit pupils yielded quite good results. I recorded nice round circles but I could see some light leaks around the pupils suggesting that better blackening on the inside of the tubes wouldn’t have gone astray.
Left pupil.Right pupil.
I had the opportunity to test the SA204 in all kinds of lighting conditions. The image is quite good: sharp, nice contrast, with a surprisingly large sweet spot. Colour fringing is very well controlled, especially off-axis.In this capacity, it’s certainly in a completely different league to the Nikon Aculons I tested, which displayed alarming levels of lateral colour to my eyes. Glare suppression is quite good too. I discovered that by retracting the eyecups one notch down from fully extended improved both the visibility of the field stops and the amount of glare I recorded. The instrument has an impressively wide field of view of 6.5 degrees with very well-defined field stops. I did perceive some peripheral softness near the field edges but it was not at all objectionable to my eyes. The instrument does display strong pincushion distortion however. I took the liberty of photographing some pink flowers at a distance of about 30 yards to give the reader an idea of how well corrected the field is:
Flowers imaged obliquely at 30 yards distance. Medium Resolution Image.
Close focus was measured at about 5m, less than the 6m advertised, putting it in the same ball park as a few other 10 x 50 Porro’s I’ve used. Of course, an instrument like this excels under the stars, where the 10x magnification and 50mm objectives pull in a lot of starlight. I checked collimation under the stars by defocusing the bright star Capella using the right eye dioptre while keeping the left barrel image as sharp as possible. The focused star remained well inside the defocused anulus not only in the centre of the field but also when placed to the extreme north, south, west and east edges, indicating very accurate alignment of the left and right barrels. Examining the Alpha Persei Cluster high up in the eastern sky reveals a rich cache of stars scattered across the field, I was delighted to see that they remained acceptably small and sharp across most of the field with only the outer 20 per cent of showing some mild distortion. But even at the field stops bright stars like Vega and Altair remained quite tightly focused. Moving bright stars to the edge of the field showed little in the way of illumination drop off either. These results were most impressive for a large binocular retailing for significantly less than $100. Indeed, this instrument can be used to very good effect for general stargazing.
I estimated the field size by trying to image Alkaid and Mizar in the Plough, which have an angular separation of precisely 6 degrees 40’ or 6.66 angular degrees. I was unable to keep both stars in the same field of view but only just so, indicating that the advertised field size of 6.5 degrees was quite accurate. Views of the bright waning Moon rising over the eastern hills showed very nice results, with excellent crater detail coming through across the southern Highlands. There were a few minor internal reflections seen around the silvery orb, but they weren’t judged to be too offensive. I could detect a sliver of chromatic aberration at the edge of the Moon when centrally placed in the field but this could be largely ameliorated by carefully reconfiguring eye placement. Off-axis colour fringing was more obvious though, but nothing I would describe as being out of the ordinary.
There was one negative however, and it manifested itself as I was imaging star fields in the vicinity of some streetlamps. Some of this peripheral light was entering the field, brightening the background sky by a tad. This disappeared however when I moved to the darkest location in my garden away from such light sources. In contrast, my Nikon E II 10 x 35(retailing at nearly ten times the price of the SA204) handled this stray light much more effectively. That said, I don’t count this as a major issue, and Svbony would do well to blacken the inside of the barrels that little bit more effectively.
Aperture Wins!
Comparing the Svbony Sa204 10 x 50(left) and Nikon E II 10 x 35(right) under the starry heaven.
Lest anyone be uncertain about the benefits of aperture, I took the opportunity to test both the SA204 10 x 50 and Nikon E II 10 x 35 under a dark country sky with no Moon during the wee small hours of September 17. Turning the instruments on the faint galaxy duo M81 & M82 in Ursa Major, I did manage to see them in both instruments, but they were much easier to see in the 10 x 50. The same was true when I moved the instrument to the celebrated Double Cluster in Perseus, now passing near the zenith at about 2.00 am local time. The view was compelling in both instruments, but the clusters were considerably richer in the larger glass. Ditto for the wondrous Pleiades and Hyades in Taurus as well as tracking down the trio of Messier open clusters in Auriga still low in the east. Indeed, I was quite impressed by just how well the SA204 managed to image the Hyades, with its constituent stars filling most of the field. I noted how well defined fiery red Aldebaran presented itself when positioned at the south-eastern edge of the field! All this to show that ‘you cannae change the laws o’ physics captain’ no matter how sexy and optically pristine the smaller, more expensive glass may be.
Conclusions and Recommendations
Great bang for buck!
The Svbony SA204 10 x 50 represents excellent bang for buck. It serves up a well corrected, sharp, bright and high contrast image with good control of chromatic aberration. It will serve as a fine general-purpose binocular, where it excels at low light observations and astronomy. I would have been thoroughly delighted with an instrument like this were I starting out in binocular astronomy again. I would however recommend using a more substantial neck strap than the generic one supplied with a chunky instrument like this. Better attention to internal blackening to improve contrast when observing under bright night lighting would also go a long way to making it an even better performer. That said, if you’re after a cost-effective instrument that does many things well, I would certainly recommend this neat 10 x 50 Porro to all and sundry.
Dr Neil English’s new 650+ page book, Choosing and Using Binoculars: A Guide for Stargazers, Birders and Outdoor Enthusiasts, caters for all budgets and will soon be published in paperback. Now available for pre-order.
After reviewing and continuing to use the 8 x 32 SE for a further seven months, I am more impressed than ever with this instrument. I’m not at all surprised that it has garnered more than 10,000 views on Birdforum alone, and an even greater number of visits on my website. As detailed in my original review, I showcased many terrific features of this instrument which I will summarise as follows:
Exceptional blackening around the eyepieces with near perfect exit pupils
Complete lack of any internal reflections or diffraction spikes when directed at a bright artificial light source
Exceptional colour correction from the small 32mm objectives
Exceptional glare suppression
Sensibly perfect images within its very large sweet spot
Excellent edge-of-field performance despite its lack of field flattening optics
Superb handling in all weather conditions
Exceptionally well protected objective lenses
A Reminder: left exit pupil of the Oberwerk SE 8 x 32 ED.
I’ve already commented that its sharpness and colour correction are superior to the highly rated Nikon E II 8 x 30, but its optical and ergonomic excellence has also been noted by a number of other experienced observers including the Irish birder, ‘Sancho,’ who compared it to his Zeiss TFL 8 x 32 and, based on subsequent field testing, now uses it as his ‘favourite all-round’ birding instrument. I would like to remind you of his posts here:
My Oberwerk SE 8×32 arrived today. I haven’t had much chance to “test” it, and in any case a birding bino needs to be tested over a few weeks while actually birding. Also, I am non-technical, so anything I say is “amateur user” opinion only, applying only to my eyes. I agree wholeheartedly with everything Dipperdapper says in the excellent review. Total cost to my door (in Ireland) was 368 euro, inclusive of 68 euro customs charges, plus postage. Communication and tracking details from Kevin in Oberwerk was excellent. At first, I was dismayed when I lifted the box…it felt heavy. But when I removed the packaging, and held the binos in my hand, they didn’t actually feel that heavy because the ergos and balance are excellent. Not unlike my Nikon SE 10×42, but about 50g heavier. The Oberwerk certainly is a tough, tank-like bino, feels very solid and durable. I like the longer objective barrels because I can get two fingers around them, as with the SE 10×42, and I find this helps further with stability. The objectives are deeply recessed, another feature I like because I presume they are more protected from stray light or damage. The focus wheel is stiffer than I would like, but I reckon this is the price you pay for a waterproof porro, like the Habicht 8×30. Although it is a wide wheel (see OPs photos), I find it a little difficult to get my fingers to it, and prefer the position of the FW on the Nikon 10×42. (OTOH, the diopter adjuster is on the right ocular, where the Binocular God intended….easy to adjust, but also firm enough to stay put). In any case the focusser has no play and turns smoothly. Eyecups twist in and out and have four positions. The bino came with a strap for the case, plus two straps for the bino…a lighter “stretchy” neoprene one for comfort, or a tougher fabric-type one. Try as I might, I could induce no CA, even looking against bare tree branches against a bright, high-cloud Irish February sky. In this it was the equal of my Zeiss TFL 8×32, which is excellent. The FOV (8.2 degrees) is similar, and to be honest it was sharp across most of the field, to the extent that to find any softness at all, I almost have to stick my eyeball into the bino and search sideways! In other words, the field-flattener question is a non-issue. I tried to induce flare/glare, and couldn’t manage that either, even while looking as close to the lightly-clouded sun as was possible without endangering my eyesight. I have no idea how to “measure” light transmission, but it seems plenty bright, not quite as bright as my TFL 8×32 but that’s unsurprising. I’m going to stick my neck out a bit here and say that I think the sharpness/constrast/pop (I don’t know how to separate these “concepts”) might be a little ahead of the TFL. However, this may be just because of today’s conditions, or I may be suffering from “new-bino enthusiasm”….it needs a bit more study out in the field, in different lighting conditions. The warranty is two years, but it feels like a bino that will be used by my as yet non-existent grandchildren. An interesting feature is that in the plain black box (thank you Oberwerk, no expensive fancy boxes!), there is a card headed “Quality Checklist”, with Date, Sale, SN etc., and all the features ticked off (under the headings Appearance, Mechanical, Alignment/Collimation, Resolution) and initialled “KGB” (whom I presume is Kevin rather than the defunct Soviet body). I’ll take these out and about over the next few weeks, and play with them a bit more, but I think they are a pretty stunning binocular at any price, and for 368 euro delivered a no-brainer, unless you favour roofs and very light binos.
Furthermore, Sancho followed up with this post some months later:
Hi just reporting back on the Oberwerk SE 8×32, after four months of use. You know how it is, you never “really” know until you’ve used binos in the field in various conditions. I have to say these have become my favourite “all-rounder, grab n’go” binoculars, and my closet contains original SEs and some big European badges. I thought early on there was a bit of “play” in the focus, but there isn’t, it just focusses at different speeds as you turn the dial (if that makes sense). It is the best bino I have at suppressing CA and stray light, and the image has the punch and contrast that reminds me of my old (sadly sold) Nikon EDG 8×42. I love the stereopsis (3D?) effect of porros, so that’s a plus for me. I’m sorry I don’t have the technical vocabulary for talking about optics; I just love these and am thinking of buying the Oberwerk SE 10×42 to complement them.
Another experienced observer, ‘Paultricounty,’ also offered his opinion on the 8 x 32 SE:
“These are bright and sharp binoculars. I’m going to get in trouble here with some Nikon guys, but they are brighter and at least as sharp as the Nikon SE’s. They’re more neutral in color than the Nikons and has a much wider field of view. There is no field flattener like the Nikons , so they’re not sharp to the edge. It’s a very usable FOV with fall off starting at around 75% , but no mushy edges like the Kowa BDII 6.5 and 8x and some other MIC bins. Contrast is as good as the Nikon and I couldn’t see the slightest amount of CA, clearly superior to the Nikon in that area.”
Swiss binocular enthusiast Pinac, had this to say about the same instrument on the Oberwerk website:
I ordered one online at Oberwerk in Dayton OH on a Thu midday, Oberwerk dispatched the same day, and I got the SE at my home in Switzerland after 3 business days – not bad (for Oberwerk customer service and UPS)! I had been forewarned by the various reviewers that the SE is quite big and heavy for a 8×32 – it is indeed, but build quality and finish are excellent, and ergonomics are superb, the bino fits snugly into my hands, a joy to use. The immediate impression is that for a 250 $ bino, the optics are really good.
My sample actually magnifies 8.2 x. The measured RFOV and AFOV values are a bit narrower than specified by Oberwerk, but still very nice.
Plenty of eye relief; spectacle wearers should be fine.
Nice extra travel of the focus wheel of ca. 5 dpt beyond the infinity position.
Given that the number of available good 8×30 / 8×32 porro binos is continually shrinking, this is a very welcome additon to the binoculars market, not only for porro enthusiasts.
And yet another review from a gentleman named Noah Lawes, who compared it to his Leica BN 8 x 42:
I’m extremely impressed with the 8×32 SE. It provides a beautiful, sharp, sparkling view. It compares favorably with my Leica BN 8×42, and it’s even better in some ways, including CA control, ergonomics, and handheld stability (especially when using the “hat trick” resting the bill of a cap on the prism housings. I’m working on a longer review which I plan to post on one of the forums, but for now, suffice it to say that I think this is a great binocular in absolute terms, and it’s just amazing that you can get it for $250.
It was also very favourably reviewed by the experienced Italian binocular enthusiast, Piergiovanni Salimbeni, who stated that its performance was similar to roof prism models costing €1K. Be sure also to check out the extensive video footage he captured through the instrument on his accompanying YouTube presentation.
Having said all that, I must report one additional observation regarding the instrument’s field of view. It was after comparing it to the Oberwerk Sport ED 8 x 42 that I noted its smaller field of view in comparison. Indeed, I conducted a star drift measurement and found its field of view to be 7.48 angular degrees, which is actually the same as the Nikon SE 8 x 32. Curiously, this was also noted by CNer Rustler 46 in this link.
I fixed the problem I had with the wandering dioptre, simply by securing my preferred position with a drop of Loctite superglue – problem solved!
No more dioptre wandering!
Finally, I suggest a few improvements to the instrument:
Reduce the overall weight of the chassis by housing the optics in a polycarbonate body. Better still, a magnesium alloy chassis would offer greater ruggedness and a reduced overall weight. These days, magnesium alloy is not confined to high-end models but is now being offered even on budget-priced instruments.
The focus wheel could be tuned better. Some owners have complained that there is some slack in the focuser, while others have noted its overly stiff tension. Improving this important ergonomic feature will greatly improve its enjoyability.
Please don’t be discouraged concerning the undeserved attacks Oberwerk has endured regarding its Chinese manufacture. Is not China a sovereign nation, just like all the other nations under the sun? Does it not have people? I note that most of the negativity came from folk who never experienced the instrument first-hand. Indeed, I suspect from the sheer volume of views that many of these dissenters actually ended up secretly purchasing the instrument lol!
In summary, it’s no exaggeration that the Oberwerk SE 8 x 32 is destined to become one of the great 32mm binoculars of our time. It’s all the more remarkable that you were able to bring it to market at such an attractive price point, which resonates well with my key objective to provide the reader with genuine bargains in today’s market in order to grow this wonderful hobby worldwide.
I wish you continued success with this amazing product!
Title Britain’s Birds: An Identification Guide to the Birds of Great Britain and Ireland
Authors: Rob Hume, Robert Still, Andy Swash, Hugh Harrop & David Tipling
Publisher: Princeton University Press
ISBN: 978-0-691-19979-5
pp 576
Price(UK): £20.00
Though I certainly wouldn’t call myself old, I’m certainly old school, preferring traditional ways of doing things compared with modern ‘gee whizz’ techniques. And when it comes to birding, I enjoy the challenge of first seeing and studying a new species, taking some notes, and then doing some bookwork to make a formal identification. Up to now, I’ve been using the RSPB Handbook of British Birds, which has served me quite well. It’s packed full of details about bird behaviour, habitats and basic biological information, but the illustrations, while being decent, have sometimes lacked enough detail for me to nail the identification of many smaller birds, such as warblers and finches. But that’s where this new work, Britain’s Birds: An Identification guide to the birds of Great Britain and Ireland hits the mark. This new work is lavishly illustrated with excellent full-colour photographs – a total of 3,591 in all – of the birds of the British Isles in their various stages of life, which makes identifying species much easier. The subjects are presented in their natural habitats which can prove very important to making those final decisions on the identity of a target.
Unlike the RPSB Handbook, the accompanying text is very concise and, for me, achieves an excellent balance between providing enough information to achieve an identification but leaving out unnecessary extraneous details that can all too often side-track the reader. The field experience of this multi-author text is abundantly in evidence, with astute insights conveyed to craft succinct ‘word pictures’ that clearly reveal expert identification knowledge. Each bird species is accompanied by a map of the British Isles showing where they are most likely to be found, together with arrows conveying migratory routes from Scandinavia, central Europe and Russia, as well as where summer migrants to the British Isles depart these islands in the autumn.
A typical page.
Although Britain’s Birds is touted as a field guide, its substantial weight – a whopping 1.4 kilograms – precludes its regular use as a true resource that can be used in the great outdoors. But it has a good quality sewn binding unlike the glued pages of the RSPB Handbook, which will increase its longevity going forward.
I found one entry that genuinely confused me. On page 474, the entry under ‘Nuthatches’ shows a map of the British Isles where you would come away with the impression that this species is not actively present in Scotland. This seems to be an anomaly. Nearly every passing day I’ve recorded two and sometimes many more of these birds in many different locations throughout Scotland. Nuthatches are alive and well in Caledonia!
Although published by Princeton University Press, 40 pence out of each purchase is donated to the RSPB. Undoubtedly, the RSPB, which is now approaching the 130th anniversary of its founding, has done a great deal of good in raising awareness about bird conservation and initiated many schemes across the country to conserve endangered species, there are worrying concerns that this charity has recently been infected by woke ideology, recently launching a scathing invective against the British government. I for one do not want any charity or public institution becoming politicised and promoting climate change alarmism and other ridiculous scaremongering claptrap. I don’t want to see the RSPB go down the dangerous road of virtue signalling- a path that has ruined numerous other charities. If you go woke, prepare to go broke!
That being said, Britain’s Bird’s is a tremendous work that deserves great success. Now in its second(2020) edition, it’s an indispensable guide that birders and naturalists will find invaluable. And at a retail price of £20, it’s an absolute steal!
Coatings: Full Broadband Multicoated, Dielectric coatings on BaK4 prisms
ED Glass: Yes FK-61
Waterproof: Yes
Nitrogen Purged: Yes
Dimensions: L/W: 14/12.5cm
Weight: 671g advertised, 728g measured
Warranty: 2 years
Price: $329.95
In previous reviews I expressed my great admiration for the new Oberwerk SE Porro prism binoculars, which offer exceptional optical performance for their modest price tags. These experiences got me very intrigued about the company’s Sport ED roof prism binoculars, offered in the popular formats of 8 x 42 and 10 x 42. Could these deliver the ‘Wow Factor’ I had experienced while using the SE Porros?
Admittedly, this was going to be a tall order to pull off, especially in light of the many similarly priced models now available to the consumer offering many of the same features, at least on paper. Moreover, my love of high-quality Porro prism binoculars had somewhat dampened my enthusiasm for roof prism binoculars in general. But after putting the 8 x 42 Sport ED model through its paces in a variety of favourable and adverse lighting conditions, I think the answer is a confident Yes!
Ergonomic Features
An exceptionally handsome binocular.
I contacted Oberwerk owner, Kevin Busarow, who agreed to send me a unit for review. The instrument arrived well packed and double-boxed together with its standard accessories. My first impressions were certainly very favourable. While I’m not a fan of garish colours, I have to make an exception for this binocular. This is one handsome instrument, with its very fetching dark green rubber armouring and black, twist-up eyecups complemented by the cherry apple red anodized aluminium focus wheel and right eye dioptre ring.
The textured rubber armouring is exceptionally grippy without being overly thick, keeping its overall weight down. Even in wet weather, your fingers will not slip up. The focus wheel is truly excellent. The deeply knurled edges make it exceptionally easy to turn with one finger, rotating smoothly in both directions with zero free play. Indeed, this is probably the very best focus wheel I’ve personally encountered in a roof prism binocular! 1.75 turns anticlockwise takes you from closest focus to beyond infinity.
Ditto for the right eye dioptre ring. It’s very hard to rotate but you get there in the end. Once set it will stay in place!
Belly side up.
The rubber-clad metal eye cups have two intermediate positions between fully retracted and fully extended. Moreover, after clicking into place, they hold their positions very firmly indeed. And there’s plenty of eye relief for the bespectacled among us too. I was easily able to engage with the entire field while wearing ordinary eyeglasses.
The objective lenses are unusually well recessed(~12mm) from the end of the barrels, helping to protect the coatings from the vagaries of the weather as well as acting as a protective barrier against stray light. The large(23mm) eye lenses make centring your eyes child’s play.
Note the very deeply recessed objective lenses.Large eye lenses make for very easy centring of your pupils.
Being very compact at just 14.5cm long and 11cm wide, the Oberwerk Sport ED 8 x 42 feels great in my medium sized hands. My right-hand fingers comfortably fall on the bridge and can wrap around the right barrel, while my left index finger naturally rests on the large focus wheel rendering an exceptionally secure handling experience. All-in-all I would rate the ergonomic features of the Oberwerk Sport ED as superb; easily as good as anything I’ve seen from the top European manufacturers.
Optical Assessment
I began my optical testing by looking for internal reflections and diffused light around an intensely bright light source. Setting my iPhone torch to its brightest output, and examining the image from across a room, I got an excellent result. I detected only a couple of very feeble reflections, no diffused light around the light source and no diffraction spikes. The same was true when I turned the binocular on a bright sodium streetlamp after dark.
Next, I photographed the images of the exit pupils. As you can see below, the results are very good; perfectly circular with plenty of darkness immediately around them. There is some light leakage set well away from the pupils but even with fully dilated eye pupils, you’re unlikely to be affected by it.
Left Pupil.Right Pupil.
Now for the juicy bits. When I first set the Sport ED 8 x 42 to my eyes, I assumed the optimal position of the eye cups was in their fully extended position, as they usually are. But that yielded a slight tunnelling effect which prevented me from viewing the field stops clearly, but I quickly found my ideal setting by retracting the eyecups one notch down.
How are the views? In a word; excellent! But to elaborate, the Sport ED served up tack sharp images from centre to edge. Indeed, testing the binocular alongside my Svbony SV 202 8 x 42 ED ‘control’ I was able to resolve finer grain detail on the wooden beams on a climbing frame located about 80 metres in the distance. This instrument has a remarkably large sweet spot, and while the field of view is already generously large(8.1 degrees), it feels even more expansive by virtue of the sharp field edges. This is a remarkable result given that the instrument does not employ field flattening optics! Pin cushion distortion is also very well controlled in this instrument being noticeably milder than that observed in the Svbony control instrument. Colours are bright and true to life with a slightly warm tone which I very much enjoyed.
Glare control is decent in the Oberwerk Sport ED 8 x 42. Only in the more severe lighting situations did I detect some. Colour correction is also WAY above average, even for its ‘ED’ billing. Indeed, after conducting many hours of testing on a variety of high-contrast targets, I could only detect the merest trace of off-axis chromatic aberration, and only at the extreme edges of the field of view. Those who find colour fringing annoying will find the Oberwerk Sport ED to be a refreshing break from the norm!
Notes from the Field
A wonderful companion in the great outdoors
One of the first tests I performed was to check collimation under the stars. This is easily done by turning the right eye dioptre so that it defocuses a bright star in the right barrel while the left barrel keeps the star tightly focused. The focused star stayed in the centre of the defocused anulus, not only in the centre of the field, but also when the star was moved around the field, checking as I did for possible detachment. The star remained centrally placed, irrespective of where the anulus was positioned inside the field. This confirmed that the instrument was very accurately collimated.
Excellent collimation also explains why I’ve been able to enjoy prolonged panning activities with this binocular, its soft eyecups being very comfortable to place your eyes against. The view is very immersive, almost as if you’re sitting in the image. Contrast and resolution are excellent, especially over longer distances. For example, I could easily pick off the variegated colours of a Goldfinch in flight over 150 metres away. The Sport ED 8x 42 has that crystal clear clarity reminiscent of high-end European binoculars like the Zeiss Conquest HD but with a significantly larger field of view.
Just a half a turn of the ultra-smooth focus wheel covers the vast majority of targets from about 8 metres out to infinity. Closest focus was measured at 2.36m, a little longer than advertised but plenty close enough for viewing insects or other targets at proximity.
The excellent sharpness of the image was abundantly in evidence when I turned the Oberwerk Sport ED 8 x 42 on the stars. Aiming the binocular on the Alpha Persei star cluster, I immediately noticed the very fine pinpoints of starlight served up by the instrument. The stars making up this celebrated cluster were incredibly fine, with the subtle colour differences among its members easily discernible. The fineness of the stellar images were unquestionably better than any roof prism binocular I’ve tested in this price class.
My subjective impressions of a large sweet spot were also confirmed under the stars. In a sense, the eye can deceive during daylight hours. The ‘trickery’ of visual accommodation and all that….. Centring Altair and moving it across the field, I noted that the image of the star stayed tight and pinpointed most of the way to the field stop. To my eye, it only showed noticeably bloating in the outer 15 per cent of the field, where slight refocusing restored the image to a tight pinpoint of white light. Conventional wisdom has it that field flattening optics are necessary for observing pristine star fields right out to the edges but the very mild field curvature in the Sport ED show that excellent results can be achieved without such optics.
Conclusions & Recommendations
Sweet.
Test driving the Oberwerk Sport ED 8 x 42 has been nothing short of a revelation. Just when you thought you’ve seen it all, along comes an instrument like this that upsets the apple cart. Oberwerk has really hit the ground running with the Sport ED roof prism binoculars, as the many other reviews also attest. This is a seriously good piece of kit. For a very reasonable price you get an extremely well-made instrument that functions beautifully in field use. It has superb resolution, contrast, ergonomics, and engineering, and in my opinion, there’s nothing to touch it in this price class with a fit and finish more reminiscent of a £1k instrument. But that seems to be the siren call of Oberwerk in general. Not only has it made its name in high quality large aperture binoculars, the company’s new lines of compact binoculars are also making heads turn. And that’s great news for the consumer and the hobby in general.
Dr Neil English explores the fascinating world of binoculars in his up-and-coming book, Choosing and Using Binoculars: A Guide for Stargazers, Birders and Outdoor Enthusiasts due out in late 2023/early 2024.
At the end of June 2021, after months of hype all over the internet and a string of sensationalized reports by the main stream media, the Pentagon released a 9 page report1 on the subject of 144 Unidentified Flying Objects (UFOs)or Unidentified Aerial Phenomena(UAP) documented in recent years by the US government. Millions of people all over the world anxiously awaited the findings from that report but were ultimately left disappointed and frustrated because the same report was completely inconclusive and never even mentioned the word ” extra-terrestrial” or ” alien.” Instead, the report merely stated that,
“Most of the UAP reported probably do represent physical objects, given that a majority of UAP were registered across multiple sensors, to include radar, infrared, electro-optical, weapon seekers and visual observation1.
But the Pentagon report was presaged by further hype fuelled by Harvard Astronomer, Avi Loeb, who released a sensational book, Extra-terrestrial: The First Sign of Intelligent Life beyond Earth2, in February 2021, in which he claimed that an asteroid nicknamed Oumuamua, which passed through the outer solar system in a highly unusual orbit in late 2018, displayed signs of artificiality, both in terms of its of movements and physical properties. Since then, several natural explanations have been forwarded by scientists to explain the behaviour of Oumuamua, but predictably, those were largely ignored by the media. A few months earlier in December 2020, Haim Eshed, a retired army general and former head of Israel’s Defence Ministry’s space directorate, claimed in an interview that Earth has been contacted by a “galactic federation” of extraterrestrials,3 and that “they have been waiting until today for humanity to develop and reach a stage where we will understand, in general, what space and spaceships are.”
Then on July 26 2023, the US Air Force officer and former intelligence official David Grusch appeared before the House Committee on Oversight and Authority, giving testimony on the government’s alleged coverup of evidence of Unidentified Anomalous Phenomena (UAPs), relating to the congressional committee that the US government were in possession of physical alien spacecraft since the 1930s, with evidence that included not only large components of the spacecraft but “biologic material” as well.
Stories such as these form the basis of a multi-million-dollar industry in the form of books, documentaries, the internet and Hollywood Sci-Fi blockbusters, entertaining countless millions of curious individuals across the world. But why are some people captivated with UFOs and extra-terrestrials and on what basis do they believe in their existence? Furthermore, how should we, as Christians, respond to such events?
Test everything; hold fast to what’s good4
That famous quote from St. Paul, writing to the Church in Thessalonica, provides a great place to start. The secular world has been fed a staple diet of evolutionary ‘science’ that powerfully affects the way many people think. The reasoning sounds both rational and straightforward, at first glance; life evolved on Earth and our planet is one of countless quadrillions scattered across the Universe. Life therefore must have taken hold on many worlds, and in many epochs, so it’s reasonable to expect that intelligent spacefaring aliens exist. Unfortunately, though, the latest science is casting severe doubts on this worldview.
For one thing, there are now serious doubts that evolution, as described by biologists, really happened. The origin of life is a profound mystery and given the astonishing complexity of even the simplest living cells, there is effectively zero chance that it happened by accident5. Indeed, it is arguably true that understanding how the first living cells came into being represents the greatest scientific problem of all time. Added to this, the explosive origin of most of the advanced animal body plans in existence today which emerged within a geological ‘blink of an eye’ in an event called the Cambrian Explosion, has still not been explained to any degree of satisfaction by evolutionary biologists. Furthermore, the fossil record, which scientists have now unearthed in great detail, doesn’t show any evolutionary progression over the 3.8 billion years or so since its inception. Instead, it reveals many extirpation events followed by equally rapid speciation episodes, in contrast to the expected gradualism of Darwinian evolution. Simply put, we can be reasonably confident that if a scientific theory approaches the truth, the uncertainties become smaller over time. The problem with the evolutionary paradigm is the opposite – the error bars are increasing… and rapidly.
Coupled to this is the growing realization that most of the planets orbiting other stars, both within our galaxy and in myriad other galaxies scattered across the cosmos, are now considered very unlikely to harbour habitable worlds. For example, as much as 80 or 90 per cent of all the stars that exist are cool red and brown dwarfs that would require their habitable planets to be located far too close to their surfaces to be warm enough to allow liquid water to exist. Yet the same stars are highly unstable, firing off dangerous high energy flares and ferocious stellar winds that would damage fragile living systems5. What’s more, when you factor in all the other requirements for a viable biosphere, Earth stands out like a proverbial sore thumb as being very special indeed!
We therefore suffer somewhat from what scientists call observational bias; because we see our planet teeming over with life, we naturally assume the same thing happened on countless other worlds. But, as the distinguished organic chemist, James Tour, quipped.
“Life should not exist. This much we know from chemistry. In contrast to the ubiquity of life on Earth, the lifelessness of other planets makes far better chemical sense5.”
In addition to these problems, there are real issuestrying to explain how physical beings could traverse the vast distances of interstellar space, as well as surviving the enormous forces they would encounter in manoeuvring in the spectacular ways they do in recorded video footage. Indeed, there is a real possibility that these recordings are part of some greater, overarching deception.
Biblical Guidance
If there is life out there, and intelligent life in particular, it must have been placed there by God. Yet the Biblical narrative gives us other clues about whether space-faring ETs exist or not. The secular world view posits that humans emerged from other lifeforms accidently, but the Bible makes it clear that the Earth was first prepared before humankind was placed here. Living things made Earth habitable for humans and continue to provide a life-support system for human flourishing. Would God create worlds packed with life without placing sentient beings on them? That’s a good question, but I suspect not.
Similar conclusions are reached by the Christian astronomer and young earth creationist, Danny Faulkner(PhD Astronomy Indiana University), in his book, UFOs & ETs; a Biblical and Cultural Exploration of Aliens.6 Faulkner squarely lays the blame with the brainwashing of the general public in accepting evolutionary thought:
“We must realize that nearly all discussion about such matters has been within an evolutionary framework. That worldview assumes the plurality of worlds-that life has arisen on many other planets in the universe, and that life on at least some of those planets is intelligent. Hence, in the evolutionary worldview one might expect that extra-terrestrial aliens will visit Earth from time to time. However, Christians ought not to adopt an evolutionary worldview. Instead, we ought to base what we think about on the Bible, not the ideas of men. Evolution is clearly contrary to Scripture, and so life only exists where God created it. While the Bible does not explicitly state that God created life only on Earth, the clear implication from Scripture is that God made life only on Earth and that man is the centre of God’s attention. Therefore, within a Biblical worldview, one would reject the plurality of worlds idea and would not expect extra-terrestrial aliens to have visited Earth(or even to exist)6.”
Furthermore, we read in the passages of Scripture that Jesus died “once for all7.” If there are other civilizations out there, did Jesus die for them too? Some theologians have suggested that these beings might have not fallen, as Adam and Eve did in the Garden of Eden, and so were in no need of a Saviour. But we read that the entire creation is groaning8 and that God has reserved this current Universe for a fiery destruction9. If those putative civilisations exit elsewhere in the Universe, they too will perish and that would make God a monster, which is clearly a theological non sequitur!
Occult Connections
But there appears to be a more sinister façade to UFOs(or UAPs) and ETs. Many in-depth studies conducted over many decades have shown a strong connection between these phenomena and the occult, and which often involve narratives that serve to undermine Christianity in particular. In their now classic work, Lights in the Sky and Little Green Men: A Rational Christian Look at UFOs and Extraterrestrials9, astronomer Hugh Ross, theologian, Kenneth Samples, and political scientist, Mark Clark, showcase many studies linking the obsession of the New Age movement with extra-terrestrials and flying saucers. They conclude that, while most of these sightings can be discounted by natural phenomena, hoaxes or human-made technological devices, a small number of residual cases cannot be explained away and display properties that suggest that they are real but non-physical in nature, that is, these events are demonic in nature and represent deceptions by fallen angels who can move inter-dimensionally, at one moment looking real and the next, vanishing into thin air. In this capacity, The UFO phenomenon could well be part of an End Times deception.
To my mind, our culture’s fascination with spacefaring aliens merely represents a post-modern form of pagan idolatry, a convenient distraction from the things we ought to think about. Unwilling to accept the reality of an omniscient Creator, they resort to imagining beings far in advance of our own as new gods who will solve all of humanity’s problems. Yet, as I’ve explained earlier, this is little more than fanciful thinking that has no basis in scientific reality. In short, we simply don’t expect such agencies to exist! I suspect that, in the end, the only aliens we’ll ever meet are our human neighbours. So, as Jesus taught us, we ought to love our neighbours as ourselves!
English, N., Origin Stories, Why Life is Beginning to Seem Very Special Indeed, Salvo #50
Faulkner, D., UFOs & ETs; a Biblical and Cultural Exploration of Aliens, 2015, Answers in Genesis Press.
Romans 8:28
Romans 6:10
2 Peter 3: 7
Ross, H, Samples, K., and Clark, M., Lights in the Sky and Little Green Men: A Rational Christian Look at UFOs and Extra-terrestrials, Nav Press, 2002.
Dr Neil English has a wide academic background in biochemistry, physics, astronomy and classical studies. He’s the author of seven books in amateur and professional astronomy. His new work, Choosing and Using Binoculars: a Guide for Stargazers, Birders and Outdoor Enthusiasts, hits the shelves later this year.
“What on earth were these instruments designed for? “
That was the question I posed to myself as I first brought this old classic Japanese-made Asahi Pentax 8 x 40 wide field binocular to my eyes for the first time. The view had a very sharp central image and a huge 9.5-degree field of view for an 8x glass, but the image was tinged in a weird greenish cast. A quick google search brought up a few possibilities but the most common answer was that the special coatings applied to the ocular lenses acted like polaroid sunglasses cutting down on glare, especially on sunny days. But if that were so, what was the green tint all about? I mean, I’ve never had sunglasses that imparted a greenish tint to everything!?
A original leather case with a gorgeous rose-coloured lining.
I picked the instrument up from a chap on fleabay back in early March for £65 plus £6 shipping, so £71 all in. The condition of the instrument looked immaculate, especially for a 1970s vintage glass. The original leather carry case is beautifully made with a rose-coloured lining. When I received the instrument, I was amazed how pristine it was; really like brand new. This must have been stored somewhere warm and dry for decades Indeed, the only reason I could think of to explain its tip-top condition was that it was hardly used at all!
The fine leatherette armouring is pristine for such an old glass.
The build quality of this Asahi Pentax is very impressive. Good big prisms, with a nicely tensioned central focus wheel moving very smoothly after all these years. The objectives looked singly coated with the standard bluish glint of magnesium fluoride anti-reflection coating. The right eye dioptre moved very smoothly but with great resistance to accidental displacement, with an easy-to-read +/- scale. The eyecups are made from hard plastic and so can’t be adjusted to improve eye relief for the bespectacled, but I suppose some resourceful person could shim them down to access more of the field.
Belly side up.
The instrument is extremely chunky, tipping the scales at 979g without a neck strap. I guess this was one of the instruments that helped stereotype the classic Porro as being big and bulky, although that’s not really true today I’m glad to say. I measured close focus at 6 yards – again stereotypical of glasses from this era but also no longer necessarily true today either. Using it for a few minutes,you really do come away with the impression that this was a quality instrument, especially when it saw first light all those decades ago. Based on the stampings on the front cap, this was manufactured by Zuiho Kogaku Seiki Co, Tokyo.
Serial # and angle of view.
The eyepieces are coated with a substance that reflects golden light to the eye. It’s not gold however, in case you’re wondering. The wavelength of the reflected light (~600nm) only depends on the refractive index of the coating and its thickness. I’ve heard of some folk who have removed these coatings using acetone and a bit of elbow grease with varying degrees of success. Some reported that the colour cast of the resulting images are more natural but also that it exposed more internal reflections and glare in the images they served up.
The strong colour shift renders the Asahi Pentax almost useless for birding excursions. Accurate identification relies on the binocular delivering colours that are faithful to the natural image. It’s not especially good at cutting down on glare either. Turning the binocular on some strongly backlit scenes showed up significant glare in this instrument, as it also did when I turned it on a sodium streetlamp after dark. But what’s remarkable about this instrument is the expansive field of view with very good sharpness across most of the field. As an astronomical instrument, it also does quite well but the low light transmission and colour shift renders the images a bit dimmer than a modern instrument having superior coatings.
A well-corrected 9.5 degree field is very impressive for an 8x instrument though. It’s actually larger than my Nikon EII 8 x 30(~9 degrees) and my Nikon Action 7 x 35 ( 9.3 degrees). But when I began to study a variety of older Porro prism binoculars, especially in the 7 x 35 format, I was shocked by what I discovered. Paul Wehr, a keen binocular collector based in New York was kind enough to share some images of his extensive collection of classic Japanese-made 7 x 35s with me. It turns out that 9 or even 10-degree fields were rather on the small side. Take a look at some of the models in his collection.
Here are a couple of vintage Bushnell 7x 35 Rangemasters sporting 10 degree fields:
The vintage Bushnell Rangemaster 7 x 35 with 10 degree field. Image credit: Paul Wehr.
But they come significantly wider again. Take a look at this Swift Holiday Mark II with an 11 degree field:
The Swift Holiday Mark II 7 x 35 with its 11 degree field. Image credit: Paul Wehr.
Or how about this Sans & Streiffe 7 x 35 model with a whopping 13 degree true field!
The Sans & Streiffe 7 x 35 with a 13 degree true field! Image credit: Paul Wehr.
My conversations with Paul made it obvious that he’s very impressed with these classic widefield binoculars. I would be too! Ultra wide fields like this are not unique to Porro prism models either. Take the Leica Amplivid 6 x 24, for example, sporting a 12 degree field.
Back to the Future
My personal ‘discovery’ of the existence of these ultrawide compact binocular models from yesteryear raises interesting questions in my mind. In 2023, leading binocular manufacturers like Swarovski and Zeiss wax lyrical about their wide-angle flagship models, like the NL Pure range and Victory SFs, sporting fields of the order of 9 degrees. Owners rave about their huge fields seemingly unaware that much bigger fields were available to binocular enthusiasts a half century ago.
There’s an important lesson to be learned here. Resurrecting these classic Porro prism designs with enormous fields could be done at much lower costs than those commanded by today’s top wide-angle roofs. Can you imagine what could be achieved by applying state-of -the-art multilayer coatings to the optical surfaces of such designs? Adding a field flattening lens would also make them very sharp nearly to the edge. Re-designing the eyepieces with greater eye relief wouldn’t go amiss either. Adding seals would render them water proof and purging them with dry nitrogen gas would keep them from fogging up in cold /humid weather.
Some of these sentiments are echoed in Holger Merlitz’s excellent article linked to in the preamble above. In particular, he makes the point that by incorporating modern, wide-angle eyepiece designs into these classic models, they would deliver wider and better corrected fields of view.
Just imagine what could be achieved!
It would surely usher in a revolution in binocular technology, and open the hobby up to more people if they’re offered at a significantly lower cost than the current top tier roof models now on the market.
We can only dream!
Thanks for reading!
Neil English’s new book: Choosing & Using Binoculars: A Guide for Stargazers, Birders and Outdoor Enthusiasts, will be published in late 2023 by Springer Nature.
I would like to sincerely thank Paul Wehr for sharing images of his classic wide-angle models, as well as his enthusiastic conversations about their potential.
It’s been nearly two years since I first hit on the new high-performance Svbony SV202 ED binoculars. It was pure serendipity on my part; I was drawn to the list of features the 8 x 32 model possessed with an eye to discrediting the claims. Why? Because the price was simply too good to be true. I found out however that far from being marketing hype, these instruments delivered in spades, with excellent coatings, brilliant images and superb ergonomic construction. Thus far, I’ve tested all four models; the 8 x 32, 8 x 42, 10 x 42 and 10 x 50, but I settled on the newest addition to the series; the formidable SV202 8 x 42 ED; an instrument that has become one of my favourite field glasses in over five years of optical testing and evaluation involving hundreds of models across all price ranges. Indeed, I’d go so far as to say that these amazing instruments have set in motion an unstoppable revolution that’s bound to continue in the coming years, as European manufacturing enters a self-inflicted, suicidal death spiral owing to the wicked green agenda that is destroying industries for the sake of the pseudoscience of anthropogenic climate change. Our school teachers have become activists, brainwashing and indoctrinating our children with lies. There is no discipline and no boundaries. No wonder they’re so ill-equipped to cope with life in the modern world. It’s a recipe for disaster.. Our universities too are churning out ignorant, woke‘graduates’ who simply can’t compete with the academic excellence coming from Chinese technological universities. They’d eat ours for breakfast. Small wonder, therefore, that Chinese optical quality is rapidly approaching the so-called alpha class of western-made binoculars. For me, the SV202 line of roof prism instruments are on the cutting edge of that revolution.
Optical Quality
An optical and ergonomic marvel.
I’ve owned and used the SV202 8 x 42 ED now for about six months. It’s been a reliable companion in all weathers the Scottish climate can throw at you: rain and hail, snow and ice, wind and sun. My journals reveal that it’s clocked up about 100 hours of service. And in all that time it’s behaved flawlessly, delivering pin sharp images within a large sweetspot. Brightness and contrast are second to none. It’s sharper and better colour corrected than my Nikon E II 8 x 30- my favourite Japanese-made Porro prism binocular – and has served up some incredible views of birds, trees, hills, rivers, ponds, valleys, flowers, insects, and other wildlife. It’s got great close focus too at just over 2 metres, and exhibits superb control of internal reflections and glare. Indeed, the Svbony SV202 ED quickly became my control instrument when testing and evaluating many other roof prism models featured in my up-and-coming book. I’ve tested it against very high quality binoculars costing many times more, up to and including the likes of the Swarovski EL 8.5 x 42 and I’ve never felt like it was pulling much behind; it’s just that excellent!
Check out those excellent antireflection coatings!
Ergonomic Excellence
The SV 202 8x 42 ED is, without a doubt, built to last. I was horrified by the response of some individuals on Birdforum who continuously expressed their doubts that such instruments simply couldn’t last the test of time. Such individuals are speaking in ignorance, of course, as they’ve never actually bothered to test these instruments out for themselves. I was particularly delighted to hear of one recent poster who decided to buy the 10 x 42 model out of curiosity as well as the excellent price with which they are now selling on sites like Amazon and AliExpress. He provided his honest opinion of it, reporting that it delivered 90 per cent of the image and build quality of his 10 x 42 Nikon Monarch HG. This was especially poignant given that the same individual bought the Svbony SV202 for just £70 with a coupon. The Monarch HG, in comparison, retails in the region of £1000 UK. He’s absolutely correct in making that claim; the Svbony wonder binoculars are really that good!
Happy is the man whose dioptre ring never wanders.
The instrument has a basic, no-frills design, with a sensibly located right eye dioptre compensation ring that has not budged one iota since I first adjusted it. It’s very tight; just set it and forget it. The focuser moves with silky smoothness and exhibits no backlash or free play. The multi-position twist-up eyecups are of identical quality to the Monarch HG and lock rigidly in place. They have never let me down. I’ve tested the instrument’s waterproof status(IPX7 rated) and it’s lived up to those promises.
A brilliant focus wheel.
I’ve also observed on many occasions over the winter that it’s fog proof. Condensation builds on the outer lenses when brought in from the cold but the interior always remained bone dry. The excellent non-oxidising rubber armouring is possibly unique. It’s incredibly easy to grip and is an absolute pleasure to hold in my hands, weighing in at just over 700g. All in all, the 8 x 42 has been an absolute powerhouse of optical and ergonomic virtue, so much so that it’s the only full-size roof prism binocular I now use. Furthermore, I consider all European brands to be a profligate waste of money.
Roamin’ in the Gloamin‘
The Gloaming.
May 9
The evening light of May is arguably the most beautiful of the year. The setting Sun drenches the trees with their young leaves, creating spectacular light shows – known colloquially as the gloaming. The SV 202 8 x 42 ED is the ideal companion for soaking up the riot of detail in full view. Forests walks are especially thrilling, where I routinely glass busy Chaffinches foraging on the forest floor. The brightly coloured males are especially frisky this time of year. Indeed, I’ve seen them mating on many occasions over the last few weeks Like Robins, they’re quite at home with humans. Indeed I’ve been able to get within a few metres of many of them and use the 8x glass to admire their beautiful plumage. Their fearless nature endears me to them.
The spring rains cause dandelions to flourish in the more exposed parts of the forest and where they grow, colourful Goldfinches are never far away. Rarely do I observe these in isolation. Where there’s one, there’s usually two or three nearby. The males have bright yellow feathers on their heads, necks, and chests, while their wings and tail are black with white markings. Their backs are a light brownish-grey colour, and they have a distinctive black patch on their foreheads. The females, in contrast, have similar colouring, but their plumage is more muted, with less yellow on their heads and chests. I like to stand and watch them from a distance of about 5 or 6 metres, where the 8 x 42 provides exceptional views of these striking birds. Later in the season, they’ll concentrate on eating the seeds of thistles in the open fields around my home.
After heavy rain showers, the air becomes laced with the smell of wild garlic growing on the forest floor. Its leaves are ripe for the picking. We crush them into a fine paste with a pestle and mortar creating delicious salad pesto. It’s always worth while glassing these temporary explosions of green. Little Wrens are often found scampering among them, especially near burns that meander their way through the forest. Sometimes a sunbeam would break through when the wild garlic begins to glisten in the gloaming, its leaves drenched with life-giving rainwater. Such light shows are to be cherished, spectacles provided us by our Creator, the fountainhead of all that is beautiful and true.
Elon Musk is Everywhere!
May 10
I ventured out shortly after local midnight, May 10, to enjoy a few minutes under the stars. The 8 x 42 accompanied me on the vigil. Lyra and Cygnus had risen to a decent height above the northeastern horizon, Bootes was approaching the meridian and the Big Dipper loomed large nearly overhead. Scanning the sky with my 8 x 42 revealed some shocking results; nearly everywhere I pointed my binocular I could see a satellite racing through the field of view! “Elon Musk!” I exclaimed. His Star Link satellites are everywhere, changing the character of the night sky utterly and forever. I can’t imagine astro-imagers would be too happy with these developments. The visual telescopic astronomer; not so much.
Personally, I don’t mind it. It’s inevitable anyway; technological progress to be sure, linking up more people from every corner of the globe. Indeed, it’s even prophetic. I remembered the words of our Lord and Saviour Jesus Christ:
And this gospel of the kingdom will be preached in all the world as a witness to all the nations, and then the end will come.
Matthew 24:14
Musk’s armada of satellites will help bring the gospel to even the remotest people groups of the Earth, just as Jesus had foretold. Judging by the state of our world with all its wickedness and immorality, we’ve got to be close!
The afternoon of May 14 was grand and bright, allowing me to capture some images with my cell phone of the Svbony SV 202 8 x 42 and the Hawke Frontier EDX 8 x 42.The images are unprocessed and the same file size, so they’re quite comparable.
The SV 202 8 x 42 EDThe Hawke Frontier EDX 8 x 42.SV 202 8x 42 ED.Hawke Frontier EDX 8 x 42.
While the Hawke Frontier EDX 8 x 42 has a slightly larger field than the Svbony, I think you’ll agree that the images through both instruments are quite comparable. What’s more, the Hawke retails for about three times the price of the Svbony and has already garnered an excellent reputation from birders and binocular reviewers alike, so why not the SV202 also?
It just doesn’t seem fair to me!
The Hawke also suffers from more glare than the Svbony. And while it’s a very capable binocular, the Svbony glass is just as sharp and fits in my hands better. Just some of the reasons why I chose the SV 202 as my go-to mid-size roof prism binocular.
May 17
Observing at Dusk
Sunset on the Castle Drive.
Now that I’m on my long summer vacation from teaching and writing commitments (yes, the first draft of my book has now been submitted), I’ve extended my glassing to later in the evening and sometimes well into dusk. This is when the benefits of a 5mm exit pupil really comes into its own. While I do most of my daytime glassing with smaller 8 x 30 and 8 x 32 instruments, their smaller aperture and smaller exit pupils limit the amount of detail you can see when the Sun falls out of the sky. This time of year, twilight encroaches, extending the time of dusk, enabling me to make use of the 8 x 42 SV 202 more extensively to watch for owls, badgers, deer and even the odd fox. Standing still under the cover of bushes, I’ve been enjoying watching badgers roam about in the gloom, sniffing the ground and uprooting plant tubers. One of the local farmers told me he has had lambs lost to badgers but is powerless to act because they’re protected under UK law. They seem quite cute to me but get in their way and they can unleash great ferocity with those powerful jaws..
I’ve tried other 5mm exit pupil formats for this kind of ‘on the move,’ low-light observing, including a 10 x 50 and a smaller 7 x 35, but neither of those cut the mustard compared with my Svbony. The former is too too large to carry about for extended periods and has too narrow a field of view to boot. And the latter doesn’t gather nearly enough light during these challenging lighting conditions. Moreover the 7x lacks the reach of an 8x glass. The 8 x 42 format, with its nice wide field, excellent light transmission and moderate weight, makes for the ideal tool for such activities.
May 28
Serendipitous Sightings
Culcreuch Pond, late evening May 25. Note the veneer of pollen near the shore.
This is the height of the pollen season. The air is chock full of it from all the trees and bushes bursting into bloom, bringing misery to many hay fever sufferers. Thankfully, that’s not me. The surface water at Culcreuch Pond gets covered in a scum from it as it accumulates over the days and weeks. And it gets on everything -clothes, lenses, tripods, you name it! When you think of the amount of genetic and epigenetic information stored in these tiny structures, the mind boggles. It must be orders of magnitude greater than all of mankind’s digital code combined. The Lord God is a masterful designer!
On the evening of May 28, I took myself off again for a saunter up the country road towards Cuclreuch Castle. As a keen beginner birder, I’ve been learning where to scan with my binocular for interesting birds that might come into the area. One endlessly fruitful activity in this regard is to glass the fences on either side of the road. I’ve learned to scan them intently since many small passerines seem to rest there from time to time. This is where I’ve successfully spotted Goldfinches, Chaffinch, Stonechats, Robins and Wagtails, to name but a few species.
The castle road, looking west towards Dunmore hill, with fences on either side.
I had little luck this evening and turned to walk back towards the house. In the distance, I saw my eldest son and two of his mates approaching me, and stopped for a brief chat. But over their shoulder, I saw a small bird, no bigger than a Robin fly in and land on the fence about 30 yards in the distance. I quickly brought my SV 202 to my eyes and noted its colours, which were very easy to discern, as the setting Sun strongly illuminated it. At first glance, I thought it was a male Bullfinch, but there was something distinctly odd about it. Yes, it had a bright orange belly and flank, but its beak was long and slender, not muscular like most finches I’d observed. Its lower head was jet black but above its eyes it was white with a grey cap, and bluish grey wings. Excited, I asked the boys to quieten down as I took another steady look. This was a bird I’d never seen before but I memorised its appearance as best I could. And I had no idea what it was until I got home and leafed through my RSPB book. Finally, there it was in all its glory on page 263; a beautiful male Redstart! The first of its kind I had ever seen!
A male Redstart, as depicted in my RSPB book of British birds.
As I later reflected on the the sighting, I realised just how lucky I was to get a glimpse of this summer migrant to the British Isles, amber-listed in the handbook. Apparently they are more common in Wales and the West Country, but the accompanying map illustrating its distribution also showed that some sightings have been made here, just north of the Scottish central belt.
When it comes to birding, you make you’re own luck.
Chance favours the prepared birder!
Sodom 2
Cities & Towns Are No-Go Areas
The wicked month of Sodom is now upon us and that means one thing for me. I avoid the cities and big towns where they ‘celebrate’ these depraved lifestyles. I refuse to enter any premises flying the rainbow flag and give them no business. There will be all sorts of lude behaviour at these gatherings; drink and drug-fuelled orgies, men pretending they’re women and women pretending they’re men, and chemically castrated children, not to mention a complicit general public pronounced guilty(in the eyes of a holy God) by association. Monkey pox, herpes and other STDs will be spreading. As the Bible teaches:
I will set nothing wicked before my eyes; I hate the work of those who fall away; It shall not cling to me.
Psalm 101:3
Redstarts
Since my first sighting of the male Redstart, I’ve since glassed it several more times, and always in the same location; at the top of the castle drive before the pond and between two great oak trees. Methinks it’s rearing young and that requires a female. I’ve tentatively made one observation of a possible female(mate). I spotted a small bird, rather like a Robin, but without its intense red breast. At this stage I can’t be sure though.
The SV202s Going from Strength to Strength
Volks Bino
I took a look over at Amazon this afternoon to see how the SV202s were doing. I’m delighted to report that there are now80 reviews; a huge increase over the last time I looked with an average score of 4.5 stars out of 5! I’ve said it before and I’ll say it again; these are amazing binoculars! Indeed, it’s really all you could possibly want in a roof prism binocular.
The notion that you can’t get excellent ergonomic and optical quality at a price that is now affordable to many. Why pay more? These instruments will grow the hobby, allowing many more folk to get out and enjoy the creation, in all its glory!
Sodom 14
A Redstart Family
Since first sighting the male Redstart at the top of the castle drive, I’ve now observed it many more times since. Indeed, on almost every evening I take a walk there I catch a glimpse of it. What’s more, I’ve also spotted a female, with its more subdued colours. The clincher for me was identifying their nest site – a grand old oak tree. That comports nicely with the details given in the RSPB handbook which states that they indeed like to nest in oak trees. They’re incredibly graceful birds, being capable of hovering in mid-air in search of insects. I’ve often seen them foraging in the grassy kerbs at the side of the road, just like Goldfinches.
Discovering these birds so close to my home inspired me one afternoon to set up a spotting scope to study them in more detail and to maybe capture some images of these handsome creatures. I’ve been test driving a really nice spotting scope manufactured by Svbony; the SA405, an 85mm ED model with a zoom magnification range from 20x 60x. It works like a dream, delivering crisp images throughout the zoom range. While you really don’t need ED glass below about 30x, it sure does help reduce colour fringing beyond these powers. I’ve been very successful getting great close up visual views of both the male and female Redstarts, but imaging them is an entirely different matter. Because the CCD camera has a larger image scale than even the 60x setting on the zoom eyepiece, its more challenging to get the birds centred on the CCD chip. What’s more, these highly-strung birds never stay put for long; once you think you’ve got them framed, they fly off making the whole enterprise an exercise in frustration more than anything else.
The excellent Svbony SA405 85mm 20x 60x ED spotting scope.
Consistency
My up-and coming book on binoculars has given a well-deserved pride of place to the SV202 ED binoculars. While reflecting on their success, I realised that they all seem to have excellent control of internal reflections; right up there with the very best European models in fact. Take the appearance of the exit pupils, which I’ve photographed in the past as part of my reviewing work. Here they are again for interest:
8x 42.10 x 50.10 x 428 x 32
Now, that’s what I call consistent!
Good round pupils with an extensive area of darkness surrounding them. And no false pupils either!
Sodom 25
Superior close focusing properties.
Horses for Courses
Though I’m a big fan of high-quality Porro prism binoculars, there are tasks that roof prism binoculars just excel at. One of these is comfortable close focus ability. I say ‘comfortable’ because although my beloved Nikon E II 8 x 30 actually focuses closer than my SV 202(1.95m versus 2.2m), glassing anything closer than about 5 or 6 metres is quite uncomfortable in the E II, necessitating an adjustment of the interpupillary distance downwards below my natural 65mm. In contrast, the SV202 delivers images that are much easier on the eye. This advantage really comes into its own viewing small birds at close distance, such as Willow Warblers and Treecreepers. My experiments in forests with both roof and Porro prism binoculars have also compelled me to favour the former over the latter in such environs.
Seeing the Light
The images served up by the SV202 8x 42 are very bright and sharp. I’ve compared it side-by-side with much more expensive binoculars with high(~90 per cent) light transmissions and have failed to see any significant differences in low light conditions. When I first began my binocular studies, I often came across statements which claimed that binoculars with ED glass deliver brighter images and words to the effect of, “the ED glass gives you an extra five minutes when the light really begins to fade.” Now, I’ve compared models of exactly the same specification, with one having ordinary crown-flint glass and the other possessing an ED element under rigorous low light tests and not noticed any differences. I wondered where this false meme originated from, since there is always a grain of truth to most of these ideas. It was after studying some of the physics of Augustin-Jean Fresnel(1788-1827) that I got a lead. His equations provided important advances in computing how much light is transmitted and reflected with materials possessing different refractive indices.
Many of the Fresnel equations are quite complex, as they involve light incident upon a surface at different angles. Let’s look at one particular equation:
R = Cos x – (n2 – sin2x)1/2/Cos x + (n2 – sin2x)1/2
Where R = the amount of reflected light from an optical surface
x = the angle of incidence and n= the refractive index of the material.
We can simplify this greatly by considering light arriving directly along the normal( i.e. looking at the centre of the lens head-on, so x =0), from which we obtain the much simpler equation:
R= [1-n/1+n]2
So the amount of reflected light only depends on the refractive index of the optical glass used. Now consider regular crown and flint glass having a refractive index of about 1.5. The amount of light reflected off such glass for normal incidence is
R = [1-1.5/1+1.5]2 = 0.04
Note: This is the origin of the 4% figure often quoted in telescope optics texts for uncoated glass.
Next consider extra low dispersion (ED) glass like fluorite or FPL 53 or some such, with a refractive index of 1.44. Plugging this number for n into the Fresnel equation delivers a value of 0.03 or 3 per cent.
This means that regular crown or flint glass transmits 96 per cent of the light incident upon it compared with 97 per cent for ED glass.
This is a very small difference but considering that only one or two elements in the optical train employ ED glass, and the applications of multiple layers of antireflection coatings further reduce the light losses for both types of glass, the visual difference in brightness will be all but indistinguishable.
So there you have it! Although the Fresnel equation allows for a one per cent difference in transmission, it amounts to effectively negligibledifferences in overall transmission, all other things being equal.
In Part I of my review, I described the general optical and ergonomic features of the Svbony SA405 20x-60x 85mm ED spotting scope. In Part II I would like to reveal more about its ability to incorporate different eyepieces as well as its imaging capabilities.
The zoom eyepiece accompanying the SA405 is removed simply by rotating the rubber sleeve at the base of the eyepiece housing anticlockwise which loosens the grip on the zoom, allowing it to slide up and out of the ocular interface. The photo below shows the rectangular face of the Porro prism just beneath an anti-reflection-coated optical flat situated immediately above it, which effectively seals off the optics from the ambient environment.
The eyepiece interface of the SA405. Note the optical flat and prism edge.
The nicely designed stops prevent any direct contact between the inserted eyepiece and the flat so there’s no chance of it cracking or scratching the glass. After inserting the new 1.25” eyepiece it can be tightened via a helical mechanism by rotating the rubber sleeve clockwise until its tightly fixed in place.
In the next series of photos, I‘ve attached a Sirius Plossl 7.5mm and a Celestron X-Cel 25mm- to the scope.
The 7.5mm Sirius Plossl attached to the scope.The Celestron X-Cel LX 25mm inserted into the ocular interface.
But by far the most versatile eyepiece I found for this scope is the Svbony SV 191 7.2-21.6mm zoom eyepiece offering a magnification range between 22.3x to 67x, so a modest gain in magnification over the original 20x- 60x. More on this zoom later.
The Svbony SV 191 7.2mm-21.6mm zoom eyepiece.
Determining the Maximum Field of View Available to Ordinary Eyepieces using the SA405
The provided zoom serves up a maximum field of view of just under 2 angular degrees. I determined to establish whether I could expand this field by using fixed focal length eyepieces. In this capacity, I set up some experiments using both a Celestron X-Cel LX 25mm with a 60 degree AFOV. In theory this should have served up a true field of 3.1 angular degrees. In addition I tested a 32mm Skywatcher Plossl eyepiece which should serve up a field of 3.45 angular degrees(52 degrees AFOV). However, the effects of vignetting would likely come into play, restricting the true size of the fields generated by these long focal length eyepieces.
Performing the star drift test on the SA405 to determine true field size.
Accordingly, I measured the fields of these eyepieces by conducting a star drift timing test. In the wee small hours of a late May morning, under decidedly twilit conditions, I centred the bright star Altair with a declination of +8.87 degrees, so just above the celestial equator(well within the +/- 20 degrees required for accurate results), I timed how long it took for the star to reach the field stop and used these values to calculate the true field( times were actually doubled). The results I got were as follows:
25mm Celestron X-Cel LX – 3.05 degrees
32mm Skywatcher Plossl- 2.93 degrees
Comments: The Celestron eyepiece served up a field size in good agreement with its specifications. The Skywatcher, as expected, vignetted the field, delivering a field size pretty much indistinguishable from the shorter focal length Celestron. Since there is no material advantage to having a lower magnification with the same field size, the Celestron is the better eyepiece for dedicated low-power widefield viewing.
Experiences with the Svbony SV 191 7.2-21.6mm Zoom Eyepiece
The excellent SV 191 7.2-21.6mm zoom eyepiece mated to the SA405 spotting scope.
The SV 191 7.2-21.6mm zoom is a very nicely designed eyepiece. The zoom motion is extremely smooth and continuously variable. It has twist up eyecups with excellent eye relief. Unlike the 20x-60x zoom that comes as standard with the SA405, the SV 191 can be used comfortably with eyeglasses throughout the entire magnification range. Another really neat feature of this zoom eyepiece is that it’s parfocal – or very nearly so. That means that only very minor tweaking is necessary if you decide to change magnification. Moreover, the SV 191 zoom tips the scales about 100g lighter than the supplied zoom, reducing the overall weight of the scope – surely a good thing when portability is to be considered.
Optically it’s very nice too. The image remains tack sharp all the way through the full magnification range. Contrast is very impressive with accurate colours coming through. The SA405 remains very well corrected for false colour using this eyepiece, as the image below illustrates.
On the evening of May 27, I took a simple handheld shot of the first quarter Moon at the 67x setting through my iphone7. I hope you’ll agree the image generated shows excellent details along the terminator with the magnificent Apennine Mountain range visible near the top of the image.
The first quarter Moon at 67x through the SA405 using the SV 191 zoom eyepiece.May 27 2023 at 11.20pm local time.
Zoom eyepieces have really come along way over the last decade or so. Having owned and enjoyed the Baader 8-24mm Hyperion zoom for astronomical applications, this nifty Svbony eyepiece delivers equally good images in my opinion but at a fraction of the former’s retail price. I picked this up for £58.99 on Amazon UK.
I took the opportunity to do some more star testing with this new eyepiece, taking advantage of its higher maximum power over the supplied zoom. Conducting several tests over a few nights of good, stable seeing, I’m confident to declare that its figure is a solid 1/6 wave P-V under-correction; an excellent result.
The SV 191 also afforded an excellent opportunity to see the effects of boosting magnification while observing a star field.
Starting at the 21.6mm setting, the sky is quite bright with only the brighter stars being visible. Racking the magnification upward allowed me to immediately see much fainter stars in the same field, as the sky became progressively darker; an easy and compelling way to see the dramatic effects of magnifying power on a telescopic image.
Higher Power Experiments and the Grey Heron that Came to Nest
I’ve tried using a few Barlow lenses to boost the power of the spotting scope in the hope that it can be called into play for higher power astronomical observing. The results I’ve achieved thus far are mixed. For example, by unscrewing a regular 2x Barlow lens housing and mating it to the either the SV 191 or a 10mm and 7.5mm Plossl eyepiece, I can get rather good images but only on nearby objects. The arrangement doesn’t come to focus on targets beyond abut 40 metres or so. Still, what I’ve seen thus far encourages me. There is more chromatic aberration in evidence, as expected, but the images remain sharp and well defined. I have ordered up a decent quality 4mm Plossl eyepiece that I hope to use to boost the magnification to 121x, thereby bypassing the need for a Barlow. I’ll report back on my findings once I’ve conducted those tests.
Over the last few weeks I’ve come to discover that there’s a Grey Heron nest within a stone’s throw of my back door. I was first alerted to this not by seeing anything, but by hearing it. One evening, as the dusk was darkening, I was setting up my 130mm Newtonian telescope for a night of double star observing. The air was filled with the sound of Rooks, many of which roost in the copse beyond my back garden, but every now and then, I heard an entirely different sound; a sound I had heard before – the sound of a Grey Heron!
It was coming from the trees immediately to the left of my house, but judging by how loud it was, it couldn’t have been more than a few tens of metres away. On another evening, I was coming back from a walk with my binocular, when I first sighted something unusual as I made my way through the swing park just across from my house. Something was fluttering in the conifer trees to the left of my back garden which caught my eye, but for a few days I was unable to make a definite ID. Finally one evening, I saw something that enthralled me: an adult Grey Heron flew over the roosting Rooks, creating one hell of a kerfuffle, as it landed in a medium-height conifer where I had previously pinpointed the sounds! This was the hard evidence I had sought! Grey Herons had indeed made a nest in these trees!
To say I was surprised would be an understatement!
I mean, Grey Herons are notoriously timorous, flying away at the mere sight of anyone coming within a hundred yards of them. At least that’s what I had experienced from a few years birding at one of my local patches up at Culcreuch Pond. Boy was I surprised to discover they were roosting in some trees just beyond my garden! But as I started to converse with some more knowledgeable neighbours of mine, they confirmed that these birds do indeed choose conifers to nest in.
On the sunny afternoon of Sunday, May 28, I picked up the scope astride the photographic tripod and made my way across to the swing park, setting up the instrument along a line of sight to the nest, some 150 yards in the distance. Zooming in using the SV 191 eyepiece I was delighted to see a youngster concealed among the branches. Racking up the magnification to 67x, I waited to get a better view, and my patience paid off, as the young Heron poked its long, slender neck upwards to have a look around. It was amazing! I ran down to get my wife and a next-door neighbour also joined in to have a gander at the sight. Indeed, truth be told, my wife didn’t quite believe me when I first disclosed my suspicions, but, as they say, seeing is believing! lol
I’m now thinking about how I can best image this bird before it flies the nest!
Using the Svbony SC001 Imaging Camera
The Svbony SC001 imaging camera.
Svbony also sent me their latest imaging camera, the SC001, with the SA405 spotting scope. This neat little device has a 2 megapixel chip, with a screw-on aerial that creates a WIFI hot spot which links to the SC001 camera App that can be downloaded free from the App store.
Close up of the SC001 imaging camera.
It’s dead easy to use. Simply insert the camera into the eyepiece interface, turn on the camera and open the App. The SC001 allows you to take single images or record video. The SC001 also has a built-in UV-IR blocking filter.
The CCD chip with built-in UV-IR filter.
After playing around with the instrument for a few minutes, I set up the scope at the spot in the swing park where I had been scoping the young Heron the previous evening. I made sure to bring the zoom eyepiece to get my bearings, as the SC001 produces pictures with an image scale equivalent to the 60x zoom setting. Once the camera is switched on and the aerial attached you open the App and the camera begins delivering live images to your phone. Simple. The stored images must be downloaded to your photo gallery in order to get the full resolution details.
The SC001 mated to the SA405 spotting scope.
As luck would have it, the young Heron was active in the nest this evening, and after focusing carefully, I began taking a series of shots, three of which are shown below. All the images of the Heron(s) were taken on a warm sunny evening making imaging at long distance more challenging.
The young Grey Heron as imaged by the SC001 camera. Distance 150 yards.
The reader will note that no image processing was conducted.
What an impressive piece of kit! So easy to use, small and easy to carry about!
As soon as it got reasonably dark on Monday May 29, I ventured out again with the SA405 spotting scope with the SC001 imager. Here’s a shot I took of the waxing gibbous Moon. The reader will note that this was the raw image delivered by the camera with zero processing.
The waxing gibbous Moon as imaged with the SA405 spotting scope and SC001 imaging camera, captured on May 29 at 11.15pm local time.
As you can see the camera did a great job picking up those finer lunar details. The image scale is more like 75x though and not 60x as originally stated. I also note the amount of colour fringing is even less using the SC001 imaging camera, indicative that at least some of the already minimal amount of colour fringing was attributed to the use of the SV 191 eyepiece. Indeed, I was able to verify that the same level of colour fringing was captured using the supplied 20x -60x zoom eyepiece.
Conclusions & Recommendations
The SA405 is an excellent, high performance spotting scope, offering crisp, high-contrast images with minimal colour fringing consonant with its triplet ED billing. It can be used for purely visual work but also works well with modern Digi scoping methods, and when coupled to the SC001 imaging camera, it serves up excellent images with even better colour correction than that observed visually. The SC001 camera is a brilliantly designed device that can be used virtually anywhere, as it creates a WIFI hotspot with your mobile phone. and is small and lightweight for easy transport in the field. I would heartily recommend these instruments to both novice and advanced birders and naturalists who wish to get the very best bang-for-buck for their hard-earned cash. That’s got to be good news in these hard economic times we find ourselves in.
Dr Neil English’s new book, Choosing & Using Binoculars: A Guide for Stargazers, Birders and Outdoor Enthusiasts, will be published later this year.
24/6/23 Postscriptum: Svbony has compiled a short YouTube video presentation of some of the Images I captured through the SA405 and SC001 Imaging Camera!
