Two eyes, a wide field, and no setup at all · review
A 10x50 from Pentax’s Jupiter series, listed with a single specification line and nothing else.
The bottom line A recognised model behind an advertisement so sparse it repeats the only number in the product name.
The listing carries a single technical statement: “optical zoom: 10.0 multiplier x”. That is a marketplace field, filled in with a figure already present in the product name, applied to an instrument that does not zoom at all.
Ten times, fifty millimetres, five-millimetre exit pupil. That is enough to know this is a conventional astronomy binocular of the standard specification — and it is everything the advertisement establishes.
Are the prisms BAK4 or BK-7? Are the optics coated, fully coated, multi-coated or fully multi-coated? What does it weigh? How wide is the field? Each of those changes the instrument materially, and none is answered here.
Find the series specification from the manufacturer before buying, or buy on the strength of the model name and accept the gaps. This page will not import figures from another source and present them as this listing’s.
German, French and Italian Amazon stores ran from 73 € to 80 € on the day of the survey.
American Amazon store lists it in local currency, which the euro range above sets aside.
British and Spanish Amazon catalogues hold a record for it that nobody is selling.
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 | Neither is stated in this listing |
| Prism type and coatings | The listing does not carry it · The listing does not carry it |
| 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 | DE B09VXLPPG3 · US B09VXLPPG3 · GB B01GQY4176 · FR B09VXLPPG3 · IT B09VXLPPG3 · ES B01GQY4176 |
| EAN | 0027075304123 |
No. The name 10x50 means a fixed 10x magnification. The listing’s “optical zoom: 10.0 multiplier x” is marketplace boilerplate applied to a fixed-magnification product, and it should be read as the 10x already in the name.
Prism glass, coating level, weight and field of view. Those four decide how a binocular behaves at dusk, how long it can be held and how much sky fits — and none of them is published here.
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
