20x25 Compact Binoculars Aspherical

Dimensions: 4.7 x 1.8 x 1.6 inches (folded); weight: 0.5 lbs (227 g); objective lens diameter: 25 mm; eyepiece diameter: 16 mm; magnification: 20x; field of view: 399 ft at 1000 yd; optical construction: BAK4 prisms with multi-coated aspherical lenses; light transmittance: 99.68%; body material: shockproof soft silicone with non-slip rubber armour; IPX4-rated daily waterproof and fog-proof sealing. The integration of aspherical lens elements corrects spherical aberration inherently — resulting in flatter fields, truer geometry and improved edge sharpness without software or post-processing. Combined with BAK4 prisms and 99.68% light transmission, this optical path preserves luminance and micro-contrast even under diffuse light. Focus is smooth and precise, calibrated for quick subject acquisition at varying distances. Intended for active users who prioritise portability without compromising optical honesty: amateur naturalists, photography enthusiasts scouting locations, educators leading outdoor lessons, and travellers seeking a single versatile optic for cities, coasts and countryside. Its robust build and intuitive ergonomics make it equally suited to novice and intermediate users.