Kowa BD III 10x42 XD reviewed: Wide angle has an effect
18.9.2026
Translation: machine translated
Pictures: Michael Restin
With the third generation of these binoculars, Kowa has refined the details. The Kowa BD III 10x42 XD is more compact, lighter, and boasts a wonderfully wide field of view. I did, however, find a few minor flaws.
The Kowa BD III 10×42 XD in one word? Immersion! That is what it is made for. Binoculars are considered wide-angle models starting from an apparent field of view of more than 60°. The Kowa reaches about 64°. Or, to put it more figuratively: from a distance of 1000 meters, I can survey 126 meters with it. That is a large area and changes the feeling when observing.
I was recently out and about with the Nikon Monarch M5 10×50. In a similar price range around 500 Swiss francs, but with different advantages: the high-speed optics were made for twilight and the starry sky. The Kowa BD III 10×42 XD is intended more for daytime use. With the wide angle, I can find objects more easily, keep them in view, and, as mentioned: immerse myself in the image.
Specifications and scope of delivery
Like Nikon, Kowa comes from Japan and has been developing binoculars for almost 80 years. Both manufacturers rely on a lightweight design: at just 610 grams, the BD III 10×42 XD is 35 grams lighter than its predecessor thanks to the magnesium housing and a full 70 grams lighter than its direct competitor, the Nikon Monarch M7 10×42. Verdict: featherweight.
Nevertheless, it does not feel delicate. The fully rubber-armored binoculars are grippy and handy: at 137×129×51 millimeters, they are among the most compact in their class and have shrunk slightly again compared to the predecessor.
The inner values are not new. Kowa uses special low-dispersion glass to minimize color fringing. What is called ED glass in other brands, standing for "Extra-low Dispersion," is called XD at Kowa, standing for "eXtra-low Dispersion." A proprietary name that clarifies that high-quality ED glass is used here. A particularly high fluoride crystal content promises excellent color fidelity and high light transmission.
The binoculars are waterproof and nitrogen-filled to prevent internal fogging. This is an issue if, for example, you go into the Masoala Hall in winter or have large differences in temperature and humidity elsewhere. A dirt- and water-repellent coating on the lens surfaces is intended to make them easy to maintain. To ensure you have to clean them as rarely as possible, the eyepieces and objective lenses are protected with plastic caps. They hold well in most cases. Only when I pull the binoculars out of their case do I often accidentally brush off an objective lens cap.
Now it gets briefly subjective, because it is about the external impression: visually, the dark green Kowa BD III 10×42 XD would not be my first choice. It has even lost style points compared to the predecessor model, because that one still had a silver aluminum focusing wheel, which looks more valuable to me. The new one is black rubberized and broadly ribbed – in return, it is supposed to be more precise to operate, not slip, and be easier to adjust even with gloves.
Kowa has primarily improved functional details like this. The current model is grippier and, in addition to new silicone eyecups, has also been given a different case and a better carrying strap. I wasn't even aware of that at the start of the test, but the case and strap immediately stood out positively. Both feel higher quality than what I last had in my hands from Nikon.
Hardly am I out and about with the Kowa BD III 10×42 XD around my neck, but I have to revise the impression on one point: the carrying strap is comfortably padded at the neck, but is not attached to the side, but rather quite far back on the binoculars. As a result, they dangle slightly tilted in front of the body.
The problem resolves itself as soon as they are back in the case. Nevertheless: this detail bothers me, I find the other variant better. The strap only hangs perfectly when I hold the binoculars up to my eyes. That is the smaller part of the time – but the decisive one.
The optics make up for it
I always appreciate wide angles when I have previously missed some field of view. That of the Kowa BD III 10×42 XD is really great and not just wide, but also high-contrast. The colors appear slightly warmer than with the Nikon Monarch M5.
The image is sharp and I can hardly make out annoying color fringes even in difficult lighting situations. The XD glass does a good job at Kowa. Towards the edge, the sharpness then decreases slightly without being irritating due to distortions. It is the compromise I am happy to make for the large field of view. This helps to track moving objects, it ensures a panoramic view instead of a tunnel view, and my focus is usually on the center of the image.
For the price range, the imaging performance is very good. You can at least guess it in the following photo. Since I took it handheld with a smartphone through the eyepiece, it is not representative. I am concerned with the difference in terms of the field of view and color temperature: on the left, the cooler and narrower-looking Nikon Monarch M5 10×50, which has its strengths in twilight and the night sky thanks to the larger objective lens diameter. On the right, the wide-angle Kowa BD III 10×42 XD, whose field of view I cannot even fully capture with the camera.
Since binoculars are not only intended for distant objects, a look at the close-focus limit of the Kowa is worthwhile: it is only 1.8 meters and is useful for observing butterflies or insects from a short distance, for example.
I can operate the revised focusing wheel precisely. It runs with appropriate resistance and switches quickly to infinity. I have no problems keeping the focus on moving objects. The wheel is grippy and provided with large grooves. In general, the Kowa BD III 10×42 XD fits well in the hand and does not slip, but dust also likes to stick to the housing.
Best view for spectacle wearers
The eyecups have three stops when unscrewed and click into place firmly. Without glasses, the second position is the perfect one for me. The diopter adjustment on the right eyepiece is continuously adjustable, but not important to me at all: firstly, because I have the same visual acuity in both eyes. Secondly, because I have not yet had any binoculars in my hands through which I have enjoyed looking with glasses so much. The Kowa BD III 10×42 XD is just below the "gold standard" of 17 mm with an eye relief of 16.5 mm, from which binoculars are considered optimally suitable for those wearing corrective lenses.
What is good but not perfect on paper works perfectly for me – with the first click stop, I can also observe comfortably with my glasses. The combination of eyecups, field of view, distance, glasses, and my physiognomy simply fits.
Although the Kowa is still in a range with ten-fold magnification that is manageable by hand, and due to the compact design, it can also be held stably for longer periods. But I only get perfect image steadiness with a tripod. For this, it has a corresponding thread that hides under a cover. There and in other places, not everything is quite perfect upon closer inspection: I find unsightly glue residues and the gap dimensions on the housing rubber coating are not uniform everywhere.
That is complaining at a high level and does not diminish the strong optical performance; I did not notice anything comparable with the competitor Nikon.
Made in Japan? Not quite ...
Because Kowa stands for "Made in Japan" and this is mentioned in reviews for the predecessor model: it is not true in this case. Kowa only manufactures its high-end models entirely in Japan. This does not apply to the BD III 10×42 XD series. Although it was developed and designed in Japan, it is produced more cheaply in China.
Only for this reason do you get such good binoculars for comparatively little money. That is the advantage of the upper middle class, in which we find ourselves here: you buy strong optics without paying exorbitant sums for the last five percent.
In a nutshell
Lots of panorama, improved details and hardly any weaknesses
Kowa has revised a very good pair of binoculars, focusing primarily on handling: from the focus wheel and rubber armoring to the lens caps, it is the small details that make them a bit more pleasant to use in everyday life. In addition, there is a well-padded carrying strap and an equally useful bag. More decisive for the purchase are the very good inner values. The XD glass and the wide-angle optics provide a panoramic feel and a sharp, high-contrast image with natural colors. Due to the design, the quality decreases slightly towards the edges, but it is at a high level for this price range. I only find minor flaws in tiny manufacturing defects. Since the similarly priced predecessor model already had many fans and quite a few things have now been optimized, it has earned five stars nonetheless.
Pro
- very large field of view
- sharp, high-contrast, vivid colors
- lightweight, easy to grip, and compact
- Minimum focus distance 1.8 meters
Contra
- minor imperfections in the workmanship
Michael Restin
Senior Editor
Michael.Restin@digitecgalaxus.chSimple writer and dad of two who likes to be on the move, wading through everyday family life. Juggling several balls, I'll occasionally drop one. It could be a ball, or a remark. Or both.
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