Leupold BX-2 Alpine Binoculars use the Twilight Max Light Management System to maximize light transmission by eliminating glare producing stray light. The system produces premium high definition, edge to edge clarity, and extends glassing time at dawn and dusk by up to 20 minutes. A large central focus dial delivers the precision focus you want when searching for deer in heavy cover, even when wearing gloves. Twist-up eyecups accommodate hunters with eyeglasses. A lightweight yet rugged magnesium housing protects optic integrity. The 1/4"-20 tripod mount is compatible with most field tripods, heads, and quick release plates. Leupold BX-2 Alpine Binoculars are nitrogen filled for waterproof and fogproof dependability.