Further Thoughts on the Svbony SV 202 10 x 42 ED.

The Svbony 10 x 42 ED on a forest walk.

A Work Commenced September 19 2021


In a recent review blog I put the Svbony SV 202 10 x 42 ED binocular through its paces. In that blog I explained why I thought it offered exceptional ergonomic and optical performance for the very modest price I paid for it. Here I wish to offer further evidence concerning its optical quality and notes concerning my continued use of this instrument in the field.

I set up my IPhone 7 to take some images I shot through the SVbony 10 x 42 ED while tripod mounted. The IPhone 7 was set on a three second timer to avoid vibrations being introduced into the images and all images are a composite of 10 photo bursts. The reader will note that none of the images presented have been modified in any way; they’re all raw images taken straight from the phone. All distances were measured using a laser range finder shown below:

The laser range finder used to measure the distances quoted in the pictures.

In the image below, a tree trunk at a distance of 23.1 yards is imaged through the binocular:

Unprocessed image of a tree trunk located some 23.1 yards distant from the binocular.

Note the sharpness of the tree trunk from the top of the field to near the bottom. Closer inspection shows some distortion at the field edges, but I hope you can see just how much of the field is tack sharp, with very nice contrast and natural colour fidelity.

The venerable Leica Ultravid 8 x 20 BR(left) pictured next to the Svbony 10 x 42 ED.

In the next set of images, I compared the depth of focus of the Svbony 10 x 42 ED with my Leica Ultravid 8 x 20. In both images, the tip of the post in the foreground of the image (seen at the bottom) is located at a distance of 32.3 yards.  In addition, for both images, the IPhone 7 camera was focused on the middle fence located at a distance of 43.8 yards, while the park bench seen in the background is located at a distance of 97.7 yards.

First up, the Svbony 10 x 42 ED image:

Image shot through the Svbony 10 x 42 ED. True field 6.16 angular degrees.

Now here is the same scene as shot through the Leica Ultravid 8 x 20(also tripod mounted):

Image captured through the Leica Ultravid 8 x 20. True field 6.5 angular degrees

The reader will note the greater depth of focus and edge-of-field sharpness of the Leica Ultravid 8 x 20. The Svbony 10 x 42 ED shows some distortion at the edges of the field in the background, but not in the foreground.

Now, if one compares the sharpness of the first image featuring the tree trunk at 23.1 yards with the sharpness of the tip of the post seen in the foreground(32.1 yards) of the Svbony 10 x 42 ED park scene image, one can see that the foreground post is sharper than that of the background. This suggests that over closer ranges of focus, the Svbony has a better corrected field. Only when the focus is shifted to longer distances and extended out to infinity, can one see the greater edge-of-field distortion of the Svbony 10 x 42 ED image.

This is good news for birders or those wanting to image sources within a few tens of yards, as the evidence seems to suggest that the sweet spot will be greater than at larger distances.

Note the richer colours in the Svbony 10 x 42 ED compared with the Leica Ultravid 8 x 20. This may be attributed to the greater light grasp, as well as the ED glass element in the Svbony as compared with the Leica Ultravid, which has a smaller aperture and does not feature ED glass.

These results demonstrate the very nice optical quality of the Svbony 10 x 42 ED, which features a large sweet spot and excellent centre of field sharpness that is so important to any binocular image.

It must also be noted that the actual views garnered through both binoculars with one’s eyes are far more compelling than the above IPhone 7 images suggest.

Further Notes from the Field

At 10.15pm local time on the night of September 19 2021, I examined the face of a near full Harvest Moon, located low in the south southeast. The image was razor sharp, with beautiful details of the lunar maria and ray craters. Contrast was excellent, with no internal reflections, ghost images or diffused light round about it. A thin sliver of blue and yellow fringes was seen at the south and north lunar edges, respectively, a consequence mainly of atmospheric refraction. No signs of diffraction spikes were seen emanating outward from the lunar orb.

Moving the Moon to the edge of the field revealed some darkening of the maria. This reveals some illumination drop off near the field edge, as mentioned earlier in connection to the Pleiades.

Just after local midnight on September 20, I once again examined the near full Moon as it crossed the meridian, and so at its highest altitude in the sky. Nearly all of the atmospheric refraction had disappeared and the lunar south and north edges were, to all intents and purposes, completely colour free. The view was simply magnificent! This is what I would expect in a high-quality 10x ED model.

The focuser on the Svbony 10 x 42 ED is a real class act.

I’m really enjoying the focus wheel on the Svbony 10 x 42 ED. Although I would class it as slow, it is extremely smooth and backlash free. It’s ideal for looking at slowly moving or stationary targets, which is more suited to 10x than to 8x. Images snap to extremely fine focus with none of the ambiguity I often encounter with binoculars having larger exit pupils.

More Moonwatching!

Right on schedule, as if heralding the onset of the fall, the evening of the autumnal equinox brought with it the first gales of the new season. In the wee small hours of September 22 I enjoyed watching the bright harvest Moon as clouds swept by it at breakneck speed, on the wings of a strong westerly wind off the Atlantic. I’ve never enjoyed looking at the full Moon as much as I do with binoculars, and especially when clouds roll across its surface. The light shows I enjoyed with the Svbony 10 x 42 ED were simply spell binding. The field of view was filled with some of the most amazing colours nature displays, as water droplets interact in various ways with Moonshine. The structure of those cloud formations, as seen in moonlight, is always fascinating and rewarding to watch. More on this here.

What Pictures Reveal

I’ve been thinking some more about what the camera reveals about some of the photos I’ve been capturing with my binoculars. It seems to me that if all the variables are normalised apart from aperture and magnification, one can use those images to determine answers to questions I’ve asked myself in the past. How does aperture and magnification affect resolution, colour saturation and other parameters in daytime glassing? If any one has access to the one or more of the Svbony SV 202 series of ED binoculars, they could objectively answer some of these these questions by comparing the 10 x 42 ED to the 10 x 50 ED, for example, on carefully selected daytime targets.

From some of my preliminary experiments, it seems aperture definitely affects colour saturation and resolution positively. But the unblinking eye of the camera may not accurately reflect perceived image brightness, as I seem to perceive the images through the little Leica Ultravid 8 x 20 and the 10 x 42 Svbony as much more alike in good light. I have noticed however, that colours ‘pop’ that little bit more in the larger glass. Certainly more investigation in this area is warranted.

Identifying the Nature of the Outer Field Aberrations

By examining some of the brighter stars in Aquila at about 12.30 am on September 24, I was able to establish that the off axis aberration is mostly attributed to field curvature. This was ascertained by bringing the stars to the edge of the field and attempting to focus out those aberrations. The result was fairly clear; much of those off axis aberrations could indeed be focused out, making the stars much smaller and almost pinpoint; a clear sign of field curvature.

A Great Astronomical Tool

At about 1:00 am on the morning of September 26, I enjoyed a partially clear sky and a waning gibbous Moon now approaching third quarter. It was well up in the east and I enjoyed razor sharp images of the vast southern crater fields with the 10 x 42, the magnificent ray craters, Tycho and Copernicus, the Apennine Mountains and Mare Imbrium, Nubium and Humorum. The crater fields were marble white against the steely grey of the lunar seas. Moonlight illuminated some of the clouds surrounding it and I watched the stars winking in and out of view as they raced past on a still gusty westerly wind. Imaging clouds moving through the field with the fixed stars so far away behind them gave a haunting sense of perspective. The Svbony is turning out to be a magnificent star gazing binocular, bringing Heaven and Earth together in wonderful harmony.

In the wee small hours of Sunday, October 3 2021, I arose at about 5.30am and took a peek out my back door to see if it was clear. The entire night was very unsettled, with frequent showers rolling in off the Atlantic, but interspersed by some fairly lengthy clear spells. To my delight, it was clear – magnificently so! The Pleaides had already crossed the meridian and was still very high up in the south southwest. Orion wasn’t far behind it and very well placed for observation. So I rushed inside to fetch a warm coat to cover my pyjamas, slipped on my fur-lined boots and fetched my Svbony 10 x 42 ED before venturing outside to observe the heavens. The Svbony showed me a glorious view of the Pleaides – the best I’ve seen this season. Many more stars were coming through as I was peering at it through a much thinner column of air, and though I observe from a Bortle 4 region, it seemed more like Bortle 3 on this exceptionally transparent night. The 10x glass frames this celebrated open cluster beautifully, the sheer brilliance of its constituent hot white and blue- white stars etched into my eyeball. Lovely too are the sparkling jewels which adorn the Hyades. In the Svbony, they reveal a riot of colour and the entire V shaped asterism fits snugly within a single binocular field.

Then I turned to mighty Orion, now near the meridian and enjoyed a magnificent view of the Sword handle, with the Great Nebula dominating the field. Stars remained lovely tight pinpoints of light across most of the field against a sky that appeared unusually dark. Perhaps it was the diminished light from the slumbering city of Glasgow some 25 miles as the crow flies south from here that made them appear so brilliant. Whatever it was, the beauty of the images I was sweeping up with this magnificent instrument almost brought a tear to my eye. I moved up to the brilliant belt stars and drank up the view of a blizzard of myriad faint stars – Collinder 70 – surrounding the trio This very special 10 x 42 binocular showed me one of the best views of this oft overlooked star cluster I’ve enjoyed in years. It reaches significantly deeper than a  8 x 42, the extra bit of magnifying power helping to pull fainter luminaries out of the cosmic dark

Usually, I hit the hay early on Saturday nights for Church on Sunday morning, but I’m now looking for a new Church that teaches proper Biblical Christianity, but haven’t found any one suitable just yet. Watching the glory of God’s celestial creation seemed the next best thing for me to do, and as the minutes raced by I knew I did the right thing, rising early before the sunrise.

Imposing Auriga was very high up, allowing the 10 x 42 to drink up excellent views of the Messier trio spanning its mid-section -M 37,38 and 39 – which stood out beautifully like bioluminescent jelly fish swimming in the shallows. Perseus and Cassiopeia were very near the zenith affording splendid views of the Milky Way coursing through them. Very were placed too was the great Galaxy in Andromeda, M31, and its two satellites, M110 and M32. Looking through such clear and dust free air made M31 stand out far better than it does early in the evening at the beginning of October, its vast lenticular form coming out beautifully in the 10 x 42. The Double Cluster was also a real sight for sore eyes at these lofty heights!

Over in the east, Gemini’s Castor and Pollux heralded the dawn, with both stars easily fitting in the same field. And just a few fields away I picked up the ever lovely M35, that loosely aggregated communion of middle aged suns shining though the darkness.

The Svbony is such a lightweight binocular; it’s ideal for hand-held astronomical observations, and though I could enjoy even better views if I were to place it on a tripod or monopod, there’s something very liberating about just keeping it simple. You, your binocular and your thoughts – nothing more, nothing less.

Enjoying the Season of Mellow Fruitfulness

Season of mists and mellow fruitfulness.

My admiration for the Svbony 10x 42 ED grows day by day. I’m still pinching myself about its exceptional optical performance. As autumn is progressing, we’re getting many unsettled spells, with sunshine and rain showers. These moody autumnal days provide excellent light for a binocular user, and on my walks through woods, fields and along river banks, the 10 x 42 ED is proving itself to be a real champion glass. On one afternoon, I was glassing some bright red Rowan berries drenched in fresh rain and glistening in weak fall sunlight. The crispness of the images this binocular delivers just takes your breath away! I really don’t know how this company has pulled this off, but it is practically indistinguishable from the best binoculars now available on the market. Contrast and colour fidelity are outstanding and the build quality of the instrument leaves nothing to be desired. I want to tell the whole world about this phenomenal optic. I would even encourage those who have a number of top tier binos to take the plunge and acquire this Svbony. They would surely learn a lot!

The eyecups on the Svbony 10 x 42 ED are amongst the best I’ve encountered on any binocular. Period. The click into place with all the reassurance of an alpha glass. Never will it cross your mind to worry about whether they will loosen or fail. They are excellently engineered.

An awesome lightweight looking glass.

Watching sunlight penetrate golden autumn leaves is a real visual treat with the Svbony, especially when glassing against a cobalt blue sky. Its resolving power is magnificent, showing lovely, intricate details of the veins running through them and the splendid geometries of their edges. I’ve logged several new bird species with the Svbony, including a dusky Dunnock scurrying through forest leaf litter and a maiden sighting of graceful Waxwing, proudly displaying its head crest. The extra reach of the 10x over the 8x is very welcome. Despite having a smaller field of view than its 8x counterpart, 10x is proving far more versatile than I previously envisaged. Its low weight and excellent handling make it a real joy as a prime birding glass.




To be continued……………………………..





De Fideli.

13 thoughts on “Further Thoughts on the Svbony SV 202 10 x 42 ED.

  1. This review is coming along nicely Neil!

    Really enjoying reading the finer details of this spectacular binocular.

  2. Hello Slim,
    Nice to hear from you again.
    Thank you so much for your kind feedback.
    Very much enjoying the Svbony 10x 42 ED.
    Doing a spot of stargazing tonight under a bright Harvest Moon
    A labour of love!

    Kind Regards,


  3. Thank you for the wonderful reviews on the Svbony binoculars. They have been very helpful in making my decision to buy a new binocular. I am fairly certain I will buy the 10×42 model. I also noticed a 10×50 model with the same ED glass and configuration as the 10X42. My interest is largely in the nighttime sky, so I am wondering whether to get the 10×42 or the 10×50. I would appreciate your thoughts on this.
    Terry Maurice Guelph, ON, Canada

  4. Dear Terry,

    Many thanks for your message.

    That’s a hard question to answer! I’m absolutely amazed and delighted with the 10 x 42. It’s a phenomenal performer both day and night! For me, its light weight(698g) makes it easy to hand hold while looking at the stars on a recliner.
    The 10x 50 is by all accounts another excellent performer and all others things being equal will gather 42 per cent more light than the smaller 42mm model. That will definitely pull in more stars and fainter deep sky objects but at the cost of having more weight( I believe it’s about 950g). That’s not overly heavy for a 10 x 50 but it would be more difficult to use for extended hand held observations. But if you plan to put it on a monopod or light tripod, then the decision is easy: go with the 10x 50.
    I’m sorely tempted to get the 10 x 50 myself based on the findings of another gentleman further south in England, who followed my blog and decided to get all three models(there’s also an 8 x 32).

    Whatever model you decide on, I don’t think you could go wrong with either. I believe these are the deals of the decade!

    Hope that helps.

    Kind Regards,


  5. Hello Neil

    Thank you for your helpful comments.

    One thing I did notice in the specs when comparing the 10 x 42 to the 10 x 50 is that the 10 x 42 states that the prism is phase corrected. That is not stated in the 10 x 50 specs. I wonder how much of a difference this would make.

    Thanks Terry

  6. Hello Terry,

    The 10 x 50 is phase coated. Someone checked this and they verified that it was a mistake on their advertising specs.

    I think you’re Ok to go.

    Best wishes,


  7. Hello again Terry,

    I would appreciate if you let me know how you get on with the binocular.

    There are trolls watching this site and on a Cloudynights forum discussing these binoculars and they’re trying desperately to discredit my testimony regarding them.

    Thanks and best wishes,


    • Hi Neil I ordered both the 10×42 and the 10×50 so I will see how they turn out. They are reasonably priced and should be worth the price I paid. I will let you know how I get on with them.

      Thanks for your comments and help.


      • Hi Terry,

        Thanks for the feedback once again.

        So you went for both? Good for you!

        I hope they will serve your needs well and of course, I’ll be keen to hear what you think of them.

        Thanks and best wishes,


  8. I will see which one I like best. I have a good friend who is an avid birder and the other pair would make a great gift for him. He lets us stay at his cottage in a Bortle 2 zone on an island in Lake Huron for weeks at a time at no charge, so it would be a good way to thank him. 🙂

    Thank you again for your help. It is much appreciated.


  9. Hello Terry,

    I’m suitably envious of your trip to Lake Huron!. What a beautiful place to glass!

    The gift of a binocular: can’t think of a better way to greet a friend.

    Hope it goes well for you.

    Kind Regards,


  10. As discussed on that Cloudy Nights thread the pricing on the Svbony products is all over the place. Those 10x42s I bought for my nephew that cost me $A104 last week are now back up to $A180. It’s definitely worth watching and waiting for a deal rather than going for the instant gratification.

    The one I’ve got my eye on is the SV407 2.1×42 “Super Wide Binocular for Star Field observing” which is a production version of those widefield binoculars people were making out of surplus Nikon teleconverters a couple of years back. The SV407 is priced at $A190 which is already cheaper than the alternatives from Vixen or Kasai Trading, but I’m hoping they’ll offer a deal on it before too long. These bins only have 2.1X magnification but give you a 26 degree field of view. Check them out.

  11. Hello Stuart,

    I’ve not tried out those super wide angle binos yet. But I hope to explore one at some stage in the future.

    With best wishes,


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