Two eyes, a wide field, and no setup at all · review
A nitrogen-filled magnesium-bodied 12x42 with BAK4 prisms and fully multi-coated optics, listed with a test-winner claim that names no testing body.
The bottom line A well-specified daytime binocular with an exit pupil that limits it under a dark sky, and a test claim with nothing behind it.
Twelve times magnification on 42 mm objectives. Dividing the second by the first gives a 3.5 mm exit pupil — smaller than the 5 mm a 10x50 produces, which means a dimmer image under a dark sky where the eye is wide open. In daylight, when the pupil is small anyway, that difference disappears entirely.
Magnesium body, nitrogen filling, BAK4 prisms, fully multi-coated objective, two-metre close focus. That is a decent specification list, and each item is a real claim: nitrogen prevents internal fogging, BAK4 prisms deliver a round exit pupil, and fully multi-coated means every air-to-glass surface has several layers.
“TESTSIEGER” and a grade of 1.1 appear without a named publication, without a date and without a comparison group. This page records that the claim is made and that nothing accompanies it.
Daytime. Twelve times on 42 mm is a wildlife and landscape specification, and it does astronomy as a secondary use — best braced, seated or on a tripod adapter.
German, French, Italian and Spanish Amazon stores ran from 130 € to 158 € on the day of the survey.
British Amazon catalogue holds a record for it that nobody is selling.
American Amazon store gave no result whatever, so the buy button there opens a search rather than an empty page.
Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.
Prices quoted in this text were read on 17 September 2026. The live price is at the top of the page.
| Aperture | 42 mm |
|---|---|
| Magnification | 12x, fixed by the design |
| Exit pupil | 3.5 mm — 42 divided by 12 |
| True field of view | Not published by the maker. |
| Prism type and coatings | BAK4 prisms, fully multi-coated objective, as the maker states them |
| Eye relief | Not published by the maker. |
| Close focus | 2 m, as the maker states it |
| Weight | Not published by the maker. |
| Tripod mounting | Not published by the maker. |
| Supplied accessories | Not published by the maker. |
| Amazon reference | B0D1GC6DGZ (same reference on 5 Amazon marketplaces) |
| EAN | 4260764710683 |
It is a compromise. The 3.5 mm exit pupil means less light reaches a dark-adapted eye than a 10x50 delivers, while the higher magnification darkens the sky background. It works; a 10x50 generally works better for faint objects.
It appears in the title and in the first bullet with a grade of 1.1 and no source. This site reports it as a claim made by the seller. Without a named publication and date it cannot be checked.
10x magnification · 50 mm objectives · 360 g
A waterproof 10x50 with BAK4 prisms, fully multi-coated optics and 25 mm eyecups, published at 360 g.
Best for: Long hand-held sessions where weight is the deciding factor
≈ €50
10x magnification · 50 mm objectives · 5 mm exit pupil
A 10x50 with BAK4 prisms, fully multi-coated objectives and individual dioptre adjustment, sold as an all-rounder for nature, hunting and astronomy.
Best for: A first astronomy binocular where the exit pupil matters more than the badge
≈ €74
10x · 50 mm · 758 g · waterproof and gas-filled
A waterproof, gas-filled 10x50 with BaK-4 glass, UR coating, twist-up eyecups and a metal centre focuser, published with its weight and dimensions.
Best for: Dusk and astronomy use in weather that would worry an unsealed pair
≈ $166 / £145 / €136
