Two eyes, a wide field, and no setup at all · review
A 10x50 porro binocular from Nikon’s Action line, described by the maker as suitable for spectacle wearers and easy to hold.
The bottom line A long-established 10x50 with the right exit pupil for the sky, sold on a listing that publishes almost nothing.
Ten times magnification, fifty millimetres of objective. Those two figures decide most of what a binocular does: the objective sets light grasp, the magnification sets how much of it reaches the eye as scale, and dividing one by the other gives the 5 mm exit pupil that suits a dark-adapted eye.
Field of view, weight, close focus, prism type, coating description. Three bullets is the whole of it. For a product line as well known as this one that is a thin advertisement, and this page reports what is published rather than filling the gaps from elsewhere.
At 10x a heartbeat is visible in the view. That is not a fault of these binoculars — it is arithmetic — and it is why experienced observers brace against a wall, sit in a reclining chair, or put a 10x50 on a tripod adapter. The difference in what becomes visible is larger than any difference between two binoculars of this class.
Open clusters, the brighter nebulae, comets, the Milky Way in summer, and the Moon at low power. It is the instrument that gets used on nights when the telescope stays indoors.
German, French, Italian and Spanish Amazon stores ran from 115 € to 159 € on the day of the survey.
British Amazon store lists it in local currency, which the euro range above sets aside.
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 | 50 mm |
|---|---|
| Magnification | 10x, fixed by the design |
| Exit pupil | 5 mm — 50 divided by 10 |
| True field of view | The listing does not carry it |
| Prism type and coatings | Not published by the maker. |
| Eye relief | Stated as suitable by the maker |
| Close focus | Not published by the maker. |
| Weight | The listing does not carry it |
| Tripod mounting | Not published by the maker. |
| Supplied accessories | Not published by the maker. |
| Amazon reference | B0GMS3H855 (same reference on 5 Amazon marketplaces) |
| EAN | 4580130922459 |
It is roughly what a dark-adapted adult pupil opens to at middle age. A larger exit pupil wastes light outside the eye; a much smaller one dims the view. Fifty divided by ten lands in the useful middle.
Not to use them, but a tripod or a monopod transforms what 10x shows. Every tremor is magnified ten times, and steadying the view reveals stars that hand-holding hides.
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
