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Kowa BD 10x42 XD Prominar

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Manufacturer Kowa
Model BD 10x42 XD Prominar
Lens diameter [mm] 42
Magnification [x] 10
Angular field of view [deg] 6.2
Linear field of view [m/m] 108/1000
Exit pupil [mm] 4.2
Eye relief [mm] 18
Min. focusing dist. [m] 1.5
Twilight factor 20.49
Brightness 17.64
Prisms BaK-4/roof
Dimensions [mm] 132x126x51
Weight [g] 655
Waterproof Yes
Nitogen filling Yes
Argon filling No
Image stabilization No
Tripod exit Yes
Focusing central
Warranty [years] 10
Price 1645
Additional information
Average rating (2 owners reviews)
Build quality
Optical quality
Accesories and usage
Value for money


4.50 Good
Owners reviews (2)
  1. Vámibimbero
    Vámibimbero 22 November 2019, 13:35
    Build quality
    Optical quality
    Accesories and usage
    Value for money


    IP 158.169.x.x
    Owner since: 1 month
    Price: 300
    User profile: Semipro

    Cons: The focus knob is stiff, difficult to turn, and the knob itself has some direct touch in some positiont with the central part below. Mine has one damn speck on the left side prism. Blurry edges (ca. 15% outer part of the picture).

    Pros: Excellent color rendition, minimal cromatic aberration, clean view, high light transmission. Resolution is very good. Projected image is close to eyes, no tunnel vision effect. Built quality is excellent, regarding phisical dimensions and compactness, only the focusing knob would be more easy to turn around on mine. Nice neck strap, rear and front caps with very good quality. As it is a small and handy instrumens, easy to hold with minimal movements, so view is stable. Eye relief 18 mm, real advantage for eye-glass wearers like me.

    Summary: I think that despite the Made in China tag, that suggest some possible variation between different exemplaires, it is a good binocular from the lower-mid price range. I can feel and use the Prominar advantages. It is really compact, but heavy, handsome and well balanced model. A very good all-rounder that enables to observe birds with all kind of weather, well beyond the optimal light conditions.

  2. Ray
    Ray 27 January 2015, 21:38
    Build quality
    Optical quality
    Accesories and usage
    Value for money


    IP 71.167.x.x
    Owner since: 3 months
    Price: 450
    User profile: Amateur

    Cons: The focus knob feels light but is probably that way to keep weight down. Not really a problem however. They are made in China.

    Pros: Sharp and bright image for this price range. Smaller (more compact) than other binos in the 10x42 class. I'll be traveling with them as well as taking to events because they offer a good combination of performance vs size. Focus is smooth to operate. There is a lot to like about Kowa BD 10-42 XD.

    Summary: So far I have been pleased with these binos and would recommend them to anyone that wants a smaller "full size" 10x42 glass.

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