Two eyes, a wide field, and no setup at all · review
A waterproof, nitrogen-filled 10x50 with BaK-4 prisms carrying an extra silver coating, published with its field of view, close focus, dimensions and weight.
Most binocular listings give magnification and aperture and stop. Eschenbach publishes the field of view (282 ft at 1000 yd), the close focus (9.8 ft), the dimensions (6.8 × 5.7 × 2.4 in) and the weight (26.1 oz). That is enough to compare this pair with any other on figures.
282 ft at 1000 yd is about 5.4 degrees. The whole Pleiades fits with room to spare; the belt and sword of Orion fit together. A wider field is what makes a binocular the instrument for sweeping the Milky Way.
BaK-4 prisms with an extra silver coating, which Eschenbach says improves reflectivity by 4%, behind fully multi-coated lenses. The body is nitrogen-filled and waterproof, so it will not fog inside on a cold night.
At 26.1 oz (740 g) it is typical for a 10x50. Ten times is about the limit of hand-holding; brace your elbows, lean on a fence or use a reclining chair, and more stars appear than any coating can add.
Twist-up eyecups, and the listing says glasses or sunglasses can stay on. No eye relief is published in millimeters.
On November 7, 2026, Amazon.com listed it at about $226 from a third-party seller.
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 November 7, 2026. The live price is at the top of the page.
Same aisle, closest price — what the same spend else shows.
| Aperture | 50 mm (1.97 in) objectives |
|---|---|
| Magnification | 10x |
| Exit pupil | 5 mm (0.20 in), the quotient of the two published figures |
| True field of view | 282 ft at 1000 yd (94 m at 1000 m), about 5.4° |
| Prism type and coatings | BaK-4 prisms with an additional silver coating, stated to raise reflectivity by 4% · fully multi-coated lenses · nitrogen-filled and waterproof |
| Eye relief | Not published as a figure · twist-up eyecups, stated usable with glasses or sunglasses |
| Close focus | 9.8 ft (3 m) |
| Weight | 26.1 oz (740 g) · 6.8 × 5.7 × 2.4 in (17.3 × 14.5 × 6.1 cm) |
| Tripod mounting | Not published by the maker. |
| Supplied accessories | Case, neoprene carrying strap, protective dust caps |
| Amazon reference | B005EJN004 |
| EAN | 4048347292098 |
About 5.4 degrees of true field. That is enough to frame the whole Pleiades cluster with room around it, or the sword of Orion from top to bottom.
Eschenbach coats the prisms with silver and states a 4% gain in reflectivity, which means slightly more light reaching the eye. On faint deep-sky objects small gains in transmission add up.
It does not, for the sky. It matters if the same pair is used for birds or butterflies in daylight; 9.8 ft is close for a 10x50.
8.4/ 10
A 10x50 that can be judged on numbers: field, close focus, size and weight are all published, and they describe a sealed, well-coated pair.
This model is listed on Amazon.com, at ≈ $226 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on November 7, 2026.
The observer who wants to compare figures rather than adjectives before buying
Specifications: the manufacturer sheet for telescopes and observing optics and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
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A waterproof, gas-filled 10x50 porro binocular with BaK-4 prisms, full multi-coating, a UR prism coating, twist-up eyecups and a metal center focus, published with its weight and size.
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