Oberwerk SE ED 10×42 Binocular Review. Quality Birdwatching for €279

PREMISE

The 10×42 binoculars are by far the preferred instrument for birdwatchers, because they represent a perfect mix between the maximum magnifications that can be used freehand, brightness and field of view. For this reason, many longtime enthusiasts will remember the presence of a Japanese-made 10×42 SE that for years was among the best-selling birdwatching binoculars in the world.

Currently, for those who do not have the possibility to invest large sums for a top of the range binocular, Oberwerk supplies the 10×42 SE ED. This model, compared to the Japanese binoculars, offers extra low dispersion (ED) lenses at a truly attractive price. It was kindly provided to me by Oberwerk Europe, which for the month of August 2024 suggests a retail price of 279 euros VAT included. As always, I subjected it to demanding tests in various fields of observation.

Within this article and video review, I will explore its strengths and weaknesses.

 

 

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TECHNICAL DATA DECLARED BY THE PARENT COMPANY

 

Model	10×42 SE ED
Weight	0.9 kg
Dimensions	15 x 16 x 5 cm
Field of view	6.5° C
Pupillary extraction	15 mm
Exit pupil	4.2 mm
Interpupillary distance	56 mm – 76 mm
Minimum focus	4 m
Goals	ED (Extra-low Dispersion)
Official distributor	Oberwerk Europe
Price (August 2024)	279 €

ACCESSORIES SUPPLIED

The binoculars are shipped in a rather plain black box, labeled with the Oberwerk branding and the size of the instrument. Inside, you'll find a scratch-resistant and waterproof green Cordura bag, a strap to hold the bag, a soft neoprene shoulder strap, a protective cover for both eyepieces, two objective lens caps (without a safety catch), an optical cleaning cloth, and a small instruction sheet.

As always, you won't see the accessories mounted in the article or the video, because the companies always send me new products, and I try to preserve at least the accessories from practical use in the field.

OPTIONAL ACCESSORIES

Oberwerk does not have any specific accessories for these binoculars, however, a wide range of tripods is available both on the Oberwerk website and on the website of the importer RP Optix. On the latter, in my opinion, you could also purchase the Ibis Optics tripod mount.for attaching binoculars to photographic plates, in case you need to use it for an extended period of time.

 

Available formats

 

The SE ED series includes three formats: the 8×32 ideal for landscape observation, the 12×50, very interesting for astronomy enthusiasts, and the 10×42, which in my opinion rrepresents the right compromise between the two formats, as well as being a favorite among birdwatchers. Both models have been reviewed on this site.

MECHANICS AND FIRE SYSTEM

As I've already mentioned in reviews of other formats and as you can see from the attached images, these binoculars have a classic Porro prism design. Compared to the 8x32 and 12x50 versions, they're exactly halfway between the two in terms of size and weight. My electronic scale estimated a weight of 890 grams without the caps. Of the three formats, this is my favorite because, being heavier than the 8x32, it sits more steadily in the hand and produces less vibration. At the same time, being less bulky than the 12x50, it can be held freehand with complete ease.

Its weight is slightly unbalanced towards the eyepieces, which helps to further improve stability during prolonged use. The binoculars are protected for almost the entirety of their magnesium alloy hull by a military green colored armor with an orange peel finish, which provides excellent grip, enhanced by additional spacers on the sides. As mentioned, it can be attached to a photographic tripod thanks to the 1/4-inch thread under a protective polycarbonate cap. At the front, to the sides of the eyepieces, there are two slots embedded in the body to allow for the attachment of a shoulder strap.

The focusing system is entrusted to a large knob 32x29.54 mm, protected by a knurled rubber that improves grip. Thanks to its size, the knob It can also be used comfortably with winter gloves or shooting gloves.

Model	Weight	Dimensions (closed)
Oberwerk SE ED 10×42	890 g	15 x 16 x 5 cm

 

Another advantage of these binoculars is the eyepiece translation carriage mechanics, Also known as the "bow." This component flexes little compared to products in the €100 to €200 price range, making it very sturdy. Between the minimum and maximum eyepiece translation distances, I didn't notice any noticeable differences or misalignment issues, although the focus point does naturally change.

The closest focusing distance I measured, with my vision, is about three and a half meters. From this distance, you need to rotate the dial counterclockwise almost a full turn to reach infinity. If you're focusing on an object 10 meters away, you only need to rotate the dial about a quarter turn to focus at infinity.

Diopter adjustment is handled by a small 5mm x 46mm knurled ring, which does not have a safety lock. Its rotation is smooth, as is that of the focus knob. You will therefore need to be careful of any accidental adjustments during field use. There are no reference rings, but the classic format with "+ 0 - " signs to indicate the adjustment.

Model	Minimum focusing distance	Direction of rotation	Achievement of infinity from the minimum distance
Oberwerk SE ED 10×42	3.45	counterclockwise	370°

 

OPTICS

Goals

One point in favor of this model compared to other competing products in the same price range is the presence of FK-61 ED glass lenses. This is a low-dispersion glass that, in practical field use, eliminates chromatic aberration very well. Images have a slightly warm white tone, but offer good sharpness and optimal contrast, especially in the center of the field of view.

The use of ED (Extra-low Dispersion) glass reduces chromatic aberration, resulting in clearer, sharper images. However, it's important to remember that the overall optical quality of binoculars or telescopes depends not only on the materials used, but also on the optical design, precision workmanship, and the quality of the anti-reflective coatings applied.

In this specific case, as discussed in the section on chromatic aberrations, the use of FK-61 ED glass allowed for particularly sharp and contrasty images, with excellent control of chromatic aberration. Previously, achieving such visual quality in this price range was practically unthinkable. Furthermore, I really appreciated the recessed lens cell in the optical tube, which acts as a lens hood. This feature not only protects the lens from scratches and impacts, but also helps improve stray light control.

For the more technically minded, I can confirm that this Chinese ED glass has an ABBE rating of 81.6 − and is very similar to FPL-51 glass.

 

Eyepieces

Another improvement compared to the Japanese model I mentioned in the introduction, now out of production, is the larger field of view. In fact, The Oberwerk 10×42 SE ED features an angular field of view of 6.5 degrees, which with the classic formula results in an apparent field of view of 65°. Since I personally define binoculars with an apparent field of view greater than 60 degrees as wide-angle, I can confirm that these binoculars also qualify for inclusion in Binomania's wide-angle binocular reviews.

The field lens has a diameter of approximately 21 mm, while the eyepiece, including the lens hood, has a diameter of 45 mm. The distance between the eyepieces at my standard interpupillary distance is approximately 18 mm. Personally, I can use the binoculars with the lens hoods up, but I recommend checking the observation comfort for those with an interpupillary distance of less than 66 mm.

Oberwerk claims an eye relief of 15 mm. Since I don't have complex optical instruments, I simply measured the distance from the field lens to the raised edge of the eyepiece, obtaining 13.9 mm. For eyeglass wearers, viewing comfort may vary depending on facial shape and the thickness of the glasses, so if possible, I recommend trying on binoculars before purchasing.

As for the lens hoods, which have a metal frame, I would have preferred them to be softer, since the thickness around the ring is not very thick. They are extracted by rotating without pre-set stops.

Model	Field lens diameter	Barrel diameter	Distance between eyepieces with a distance of 66 mm
Oberwerk SE ED 10×42	22 mm	45 mm	18 mm

 

Prisms

As mentioned, the binoculars use Porro prisms made of BAK-4 glass.. A slight vignetting effect is noticeable at the edges when observing a bright sky, and the field stop is quite sharp, with a small green ring at the edges. Analyzing the exit pupil and comparing it to those of binoculars in a much higher price range, I can't complain about the amount of light scattered around it.

Anti-reflective treatment

 These binoculars have been optimized with a broadband multi-layer coating on every optical surface. The color of the objectives is a ruby-purple, while the color of the treatment applied to the eyepieces is green. I have carried out various tests and can confirm that it is aor the best anti-reflective treatments I've tested in this price range.

CHROMATIC AND GEOMETRIC ABERRATIONS

 

Chromatic aberration at the center of the field

The presence of low dispersion FK-61 ED glasses allows to obtain excellent containment of chromatic aberration in the center of the field, Even subjecting the binoculars to rigorous tests, such as the white gazebo test, observing birds of prey against the light, observing the lunar limb, and observing airplanes against the light, I can confirm once again that, in this price range, the SE ED series stands out for its use of this glass. Currently, it is the best Porro prism binoculars under 300 euros that use low dispersion lenses.

Lateral chromatism

Lateral chromatic aberration begins to become visible as you move toward the edge and becomes evident around the 50% of the field, increasing in intensity as you move away from the center, though never becoming too invasive. It manifests itself, for example, as a faint greenish-purple halo at the edges of the gazebo, but is less noticeable during common nature observations.

I would like to confirm once again that The perception of residual chroma can be quite variable and depend on individual physiological conditions. Furthermore, you will rarely use binoculars to observe high-contrast details like those described. Overall, the binoculars performed in line with high-quality products, despite this feature.

Field curvature

The binoculars do not use aspherical elements inside the eyepieces, so they do not have a completely flat field of view. However, images are quite pleasing even at the extreme edges of the field of view. For example, when framing an A4 sheet of paper at 1050 meters, which I use for my high-resolution tests, I can still perceive the shape of the paper even at the extreme edges. Furthermore, during daytime use, focusing slightly to the edge shows an improvement, which highlights how the minimal degradation is partly due to mere field curvature. Under normal conditions of use and through my own subjective visual compensation, I can confirm that I appreciated the entire field, although at the edges it is not as perfect as in the best top-of-the-range models.

Angular distortion

I noticed the presence of Pincushion distortion starting at approximately 70% from the center of the field, with an approximate percentage of approximately 5%. As is well known, I'm not very sensitive to the "rolling ball" effect. For young enthusiasts, I recommend reading the Birdwatching Glossary to better understand what the "rolling ball" effect means. I can only confirm that, After a recent observation with a friend's 8×32 SE ED, I found the 10×42 more pleasant to use for panning, that is, when panoramic observing from right to left.

Other aberrations

During astronomical observation, the presence of coma and astigmatism at the edges of the field is noticeable. These binoculars are not optimized primarily for field observations, but almost 6° are dotted with very fine stars, with correct color perception.

 

Binoculars	Field of maximum sharpness (CN)	Field still usable (CU)	Unusable field (CI)	Stellar pointformity affected by
Oberwerk 10×42 SE ED	80%	10%	10%	Coma and astigmatism

 

USAF CHART TEST AT 35 METERS

As always, I performed the test with the USAF Chart at three different times of the day: early in the morning, at 12:00 noon, and at dusk. The results, as always, represent an average of the results. I remind readers that this is a purely subjective test, dependent on my visual acuity and psychophysical conditions, but I find it quite useful, especially for me, to verify any differences with other products.

At ten times magnification, I clearly perceived the number 2 with the horizontal and vertical lines. The containment of the residual color in the center of the field was excellent, similar to that of top-of-the-range products at a significantly higher price. Only a little residual green-blue-yellowish chromaticism was noticeable, especially when analyzing the external part of the paper and a lower contrast. I then used a multiplier of ZEISS Victory Mono 3×12 T* to force the magnification up to 30x. In this condition, I noticed a noticeable drop in sharpness and the image was slightly blurred. I remember that it is not possible to create a mechanical connection like between a reflex and a telephoto lens; so, in this case, I managed to slightly fit the optical body of the Zeiss teleconverter a few millimeters inside the lens hood. Subsequently, I refined the focus as best as possible and I can confirm that I could distinguish the number 5 and, in places, the difference between the vertical and horizontal lines. This factor was more or less evident depending on the atmospheric turbulence conditions. The best performances were achieved in the early morning and late afternoon. It's obvious that this type of test is also affected by the weather conditions and the season in which they are performed.

FIELD TEST

Birdwatching

Until a few years ago, for nature observations in this price range, it was reasonable to expect images with chromatic aberration, low contrast and distorted colors, especially when observing plumage. I must confirm that the Oberwerk 10×42 SE ED confirms, in my opinion, as one of the best binoculars available for birdwatching, when excellent color retention is required at a low price. In fact, it is possible to observe, in almost all lighting conditions, silhouettes of birds of prey even at high altitudes and against the light, with good containment of residual chromatism.

As you can see, I also took observations at the Germignaga hotspot, unfortunately in very difficult lighting conditions. Keep in mind that, every time I show you a nature clip, I'm forced to handhold the lens of my four-thirds mirrorless camera against the eyepiece, taking advantage of the Olympus image stabilization system. However, I can confirm that, On a day with strong backlighting and a fairly grey sky, I was unable to notice any residual chromatic aberration in the centre of the field on white herons, grey herons, seagulls and other birds.

In the center of the field, the Oberwerk delivers a color-corrected image very similar to that of high-end binoculars. The main differences are slightly lower contrast and the presence of some stray light at the edges in some lighting conditions, a phenomenon not noticeable in top-of-the-line products costing two thousand euros. However, there's nothing to complain about. The 10×42 offers a great compromise between using the 12×50 on a tripod and the 8×32 freehand. The exit pupil is also quite bright, allowing for backlit observations to examine, for example, the structure of eagles' flight feathers or to observe aquatic birds such as bitterns, which usually hide in reed beds.

Personally, I also appreciated using the binoculars on a photographic tripod. The good management of chromatic aberration, combined with the wide apparent field, allowed me to admire some interesting naturalistic scenes.

Landscape observation

Although I prefer lower magnification, very wide-angle binoculars for observing the landscape, such as admiring the boats on Lake Maggiore or the profile of the Alps, I must confirm that the 10x42 is easily usable freehand. Where the 12x50 showed more detail, thanks to the higher magnification and diameter, this 10x2 still provides an excellent representation of the landscape. The field of view is almost completely flat and its wide-angle is a plus. Even the use of FK-61 ED glass will allow you to admire snow-covered landscapes, for example, with good correction of residual chromatism, especially in the center of the field.

Twilight observation

It doesn't quite reach the brightness of a top-of-the-line 10x42 roof prism binocular costing €2,000. However, thanks to the use of Porro prisms, which have a simpler optical design and therefore fewer air-to-glass passages, and the excellent broadband multilayer coating, I can confirm that this format is even more versatile and enjoyable of the three in the catalog. The 4.2 mm exit pupil will allow you to observe pleasant naturalistic scenes even at twilight, and it cannot be compared to the best 10x42 binoculars on the market, which offer better reduction of stray light in critical situations, such as with the sun just setting, observing scenes with some haze and stray light.

Astronomical observation

As for astronomical observation, if I had the opportunity to compare the 10x42 with the 12x50, I would definitely have preferred the 12x50 for use with a tripod or at least resting on a lawn chair. The 10x42s don't quite match the performance of a classic 10x50 astronomical binocular, but they still provide a good perception of star fields. The 6.5 degree field of view is almost entirely usable, although towards the 20% from the centre coma and a little astigmatism begin to emerge. At the center of the field, star images are very sharp and contrasty, and even the brightest stars benefit from the excellent color retention offered by the FK-61 ED glass. The same goes for observing the Moon, which shows little detail, but it's important to remember that we're talking about a 10x42.

Comparison between similar formats and different prices: 279 euros vs. 2069 euros

The comparison between the Canon 10×42 and the Oberwerk 10×42 SE ED is a bit atypical and not very relevant due to the price difference, with the Canon officially costing €2069, while the Oberwerk costs €279. However, since I have both binoculars at my disposal, I think it's useful to present this comparison to you.

  The Canon provides slightly higher contrast, which can be attributed “in part” to a lower image brightness, but it results in a sharper 20%. The color retention is practically similar between the two. The Canon provides a completely flat field up to the edges, while the Oberwerk shows a loss of detail and edges starting from around the 75-80% of the field. For astronomical observing, the Canon excels with a completely flat field, showing pinpoint stars up to the edges, while the Oberwerk 10×42 SE ED reveals coma and astigmatism starting from the 75-80% of the field. The Oberwerk is not designed specifically for astronomical observing, but has proven to be very good for observing galaxies and other bright features.In summary, the Canon 10×42 IS L WP remains one of the best binoculars available on the market, but the Oberwerk can be an excellent choice in its price range.

 

PROS AND CONS

Pros:

• Excellent price-performance ratio
• FK-61 ED Lenses
• Wide-angle field of view
• Robustness and waterproofing
• Optimal trolley mechanics
• Good color rendering
• Chromatic aberration containment

Defects:

• Comfort should be checked for those with an interpupillary distance of less than 66 mm.
• Diffused light in critical conditions

IN SUMMARY

After testing the entire Oberwerk SE ED series, I can confirm that the 10×42 SE ED binoculars stand out as one of the best in their price range. This model, equipped with porro prisms and FK-61 ED glass, offers excellent optical quality, with chromatic aberration control approaching that of high-end binoculars. In the center of the field, the color correction is particularly effective, while at the edges, only a slight residual coloration is noticeable, which is not excessively invasive.

One of the most appreciated features of these binoculars is the three-dimensionality that the Porro prisms provide, making them ideal for medium- and short-range observations. This quality is particularly useful for birdwatching and other nature observations where depth perception is important.

The 10×42 SE ED represents an excellent compromise between the wider 8×32 format and the bulkier 12×50. It offers a good balance between magnification and field of view, making it versatile for both handheld observation and more stable use on a tripod. This makes it a good choice for those looking for binoculars that combine high performance with an affordable price.

The price-performance ratio is remarkable: despite its modest price, these binoculars offer optical quality and rugged construction often found only in more expensive models. For birdwatchers who want sharp, well-corrected images without the high cost of high-end models, the 10x42 SE ED is an excellent choice. The combination of size and features makes them particularly suitable for extended observation sessions, meeting the needs of most enthusiasts.

In summary, the Oberwerk 10×42 SE ED establishes itself as one of the best options in the under-$300 price range, offering superior optical quality and solid construction. It's an ideal choice for anyone looking for high-quality binoculars without breaking the bank.

 

PRICE AND WARRANTY

The suggested retail price on Oberwerk.eu for the month of August is €279 including VAT. The Oberwerk warranty, as always, is 10 years.

THANKS

As always, I thank Kevin Busarow of Oberwerk.com for the valuable information he provided regarding the genesis of these binoculars, and Pietro Romagnoni of Oberwerk Europe for providing the sample for this review. Both, as always, deserve my recognition for their work.
 

DISCLAIMER

Binomania is not a store. On my website, you will only find reviews of sports, photographic, and astronomical optical products. My opinions are impartial, as is the duty of any journalist, and I do not take any percentage of any sales from any product purchases. For this reason, if you would like to purchase or have information on any price changes or new products, I recommend visiting the official website.  Oberwerk.com By clicking on the banner, which is the only form of advertising in this article. Thank you.!