Half the weight, half the glass, one eye · review
A 12x50 monocular with BaK-4 glass, UR coating, a twist-up eyecup and a nitrogen-filled waterproof body, published at 435 g.
The bottom line A weather-sealed, properly dimensioned monocular that publishes what it weighs and not what it shows.
Four hundred and thirty-five grams. A hundred and seventy by seventy-five by seventy millimetres. BaK-4 glass, full multi-coating, a nitrogen-filled waterproof housing and a twist-up eyecup. That is a substantial specification list by the standards of this family.
Field of view. It is the number that decides how quickly a bird or a star field can be found at twelve times, and it does not appear. Everything else about the optical description is stated.
Fifty divided by twelve is 4.2 mm. That is a dusk instrument rather than a deep-night one — bright enough at twilight, and narrower than the 5 mm a fully dark-adapted eye can use.
A hand strap, and nothing else. No case, no phone adapter, no tripod thread mentioned. For an instrument built to go out in bad weather, the strap is the part that matters most, and it is described as wide.
German, French, Italian and Spanish Amazon stores ran from 79 € to 99 € on the day of the survey.
American and British Amazon stores list it in local currency, which the euro range above sets aside.
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 | 50 mm |
|---|---|
| Magnification | 12x, fixed by the design |
| Exit pupil | 4.2 mm — 50 divided by 12 |
| True field of view | Not published by the maker. |
| Close focus | Not published by the maker. |
| Prism | BaK-4 glass, full multi-coating plus the maker’s UR coating |
| Coatings | Not published by the maker. |
| Sealing | Waterproof housing with nitrogen filling, per the maker |
| Weight | 435 g, as the maker publishes it |
| Phone adapter fit | Not published by the maker. |
| Supplied accessories | Hand strap |
| Amazon reference | B09TRS7DYX (same reference on 6 Amazon marketplaces) |
| EAN | 4007922074535 |
It is at the substantial end, and it is the price of a 50 mm objective in a sealed metal-and-rubber body. Held one-handed it is noticeable within a few minutes.
It sets the distance between eye and eyepiece. Down for spectacles, up for the naked eye — and once set it stays, so the full field is visible every time rather than only when the eye happens to land right.
10–30x zoom · 40 mm objective · 4 mm to 1.3 mm exit pupil
A zoom monocular running from 10x to 30x on a 40 mm objective, with BAK4 prisms, dual focus and a nitrogen-filled aluminium body.
Best for: Daytime viewing where one instrument has to cover several distances
≈ $36 / £28 / €26
10–30x zoom · 50 mm objective · supplied with phone holder and tripod
A 10–30x zoom monocular on a 50 mm objective, IPX7-sealed and nitrogen-filled, supplied with a phone holder and a metal tripod.
Best for: Daytime and dusk viewing with a phone, where the tripod does the steadying
≈ £31 / €24
12x · 55 mm · 352 ft at 1000 yd · IPX7
A 12x55 monocular with a 20 mm BAK-4 prism, FMC optics, IPX7 sealing and a supplied smartphone adapter.
Best for: Birdwatching and dusk viewing where the extra five millimetres of objective earn their weight
≈ $109 / £86 / €90
