Kowa BD25 10x25 Compact Binocular, Green

10x Magnification and Fully Multi-Coated Optics

The BD25 10x25 uses a roof prism design with fully multi-coated lenses to maximize light transmission, ensuring images are bright and clear even with its compact 25mm objective lenses. The 10x magnification provides significant reach for identifying distant wildlife or landscape details, and Kowa's C3 prism coatings, together with the multi-coated lenses, give high light transmission for brighter, sharper images, according to Kowa.

A 320g Waterproof and Nitrogen-Filled Body

Engineered for portability and durability, the Kowa BD25 weighs only 320g and measures just 111mm in length. The body is fully sealed and purged with nitrogen gas, making it waterproof and preventing internal fogging during temperature changes. A rubber armored exterior safeguards the internal lenses and gives a firm grip, even in wet conditions.

18.0mm Eye Relief and 1.8m Close Focus

Kowa lists 18.0mm of eye relief for this 10x model, with a 5.0° real field of view. At the other extreme, its ability to focus down to just 1.8m (5.9 ft) lets you view nearby subjects such as butterflies, insects or museum exhibits at 10x.

Kowa BD25 10x25 vs. 8x25: Power vs. Field of View

Choosing between the 10x25 and its 8x25 sibling involves a direct trade-off between magnification and viewing parameters. The 10x model gives more magnification for fine detail at a distance. However, the 8x model offers a distinct advantage in other areas.

• Field of View: The 8x25 provides a wider real field of view (6.3° vs. 5.0°), making it easier to locate and track moving subjects like birds in flight.
• Low Light: With a larger 3.1mm exit pupil compared to the 10x model's 2.5mm, the 8x25 delivers a brighter image during dawn and dusk.
• Stability: The lower 8x magnification is inherently easier to hold steady, which can be a critical factor during long observation sessions without a tripod.