Two eyes, a wide field, and no setup at all · review
A long-running 10x50 porro binocular from Bushnell’s Falcon line, with coated lenses and no gas filling or weather sealing claimed.
The bottom line An honest, unsealed, lightly coated 10x50 whose porro prisms do more for the view than its price suggests.
Ten times on fifty millimetres gives a five-millimetre exit pupil — the astronomy figure. Whatever else is or is not specified, that part of the design is correct for looking at the night sky.
Bushnell writes “coated lenses”. That is the first rung of a four-step ladder: coated, fully coated, multi-coated, fully multi-coated. A porro binocular has a lot of air-to-glass surfaces, and each untreated one reflects light away and scatters some of it back as haze.
Nothing about waterproofing, nitrogen filling or fog resistance appears anywhere. For a pair that lives in a car boot and comes out in the cold, internal fogging is the failure that will eventually show up.
Porro prisms, a correct exit pupil and fifty millimetres of aperture. On the Milky Way, on a comet or on the Pleiades, that combination shows what it is supposed to show — and it does it at a price where the alternatives are compromised elsewhere.
German, French and Italian Amazon stores ran from 52 € to 65 € on the day of the survey.
American and British Amazon stores list it in local currency, which the euro range above sets aside.
Spanish Amazon store stood above 1.6× the cheapest country. A gap that size normally means stock forwarded from abroad rather than a seller on the ground, so that figure is left out of the range above.
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 | Porro, from the product name · Coated lenses, as the maker words it — the weakest of the four labels |
| Eye relief | Not published by the maker. |
| Close focus | Not published by the maker. |
| Weight | Not published by the maker. |
| Tripod mounting | Not published by the maker. |
| Supplied accessories | Not published by the maker. |
| Amazon reference | B000051ZOA (same reference on 6 Amazon marketplaces) |
| EAN | 0029757334503 |
Substantially. “Coated” means at least one surface has one layer; “fully multi-coated” means every air-to-glass surface has several. In a porro design with many surfaces, the difference in transmission and in scattered light is real.
At this price, usually. A roof prism needs phase coatings and a precise mirror surface to match a porro, and both cost money. A cheap porro is a fairer instrument than a cheap roof.
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
