Viking Osprey ED 10x25 Compact Binoculars

The Viking Osprey ED 10x25 (product ID 55448730894711) is a 10x magnification compact binocular with a 25mm objective lens. That pairing gives you a 2.5mm exit pupil and a 114m field of view at 1000m solid performance for a pocket-sized optic. The double hinge design folds down to just W110 x L110 x H40mm and weighs only 310g making it genuinely pocketable.

The glass is where these stand out. ED (extra-low dispersion) lenses reduce chromatic aberration giving sharper colour accuracy at the edges. Fully multi-coated optics with dielectric-coated phase-corrected BAK-4 prisms push light transmission high. Flat field technology keeps images sharp edge to edge. The result is bright clear views with accurate colour rendition.

The body is magnesium alloy lightweight but strong. Nitrogen filling makes them waterproof and fogproof so they handle rain and temperature changes without internal fogging. Eye relief is 16.3mm which works reasonably well for spectacle wearers. The central focus wheel is smooth and the build feels solid in hand.

A 10-year manufacturer warranty backs the whole package. Supplied with a hard clam shell case, strap and rainguard. These are a strong choice for travel, birdwatching and general outdoor use.

The 10x25 pairing gives a 2.5mm exit pupil fine in daylight but limited at dusk. ED glass cuts chromatic aberration so colour fringing at high-contrast edges is reduced. BAK-4 roof prisms with dielectric coatings and phase correction maintain contrast and colour accuracy through the prism path. Fully multi-coated lenses on all air-to-glass surfaces reduce reflection loss. Flat field technology corrects field curvature so sharpness holds to the edge of view. Nitrogen filling prevents internal fogging when temperatures change.

The chassis is magnesium alloy light and rigid at just 310g. The body is rubber-armoured for grip and protection. ED glass elements sit in the objective lens to control dispersion. BAK-4 roof prisms carry dielectric and phase-correction coatings. All external lens surfaces are fully multi-coated.

Use a blower or soft brush before wiping lenses with a clean microfibre cloth. Store in the supplied hard clam shell case when not in use. Keep them dry and avoid knocks to the hinge. The 10-year warranty covers manufacturing defects under normal careful use misuse or physical damage will void it.