Alpen Chisos ED 10x42mm Roof BK4 Prism Binocular Green 1212930. Featuring extra-low dispersion (ED) glass phase-coated BK4 prisms and fully multi-coated lenses these binoculars provide outstanding contrast and image quality. The 42mm objective lenses ensure optimal light transmission delivering sharp and vivid visuals even in low-light conditions. Built for rugged outdoor use they are waterproof fog-proof and housed in a durable magnesium frame with a textured grip for secure handling. With a 305-foot field of view at 1000 yards a 7 degree apparent field of view and a close focus of just 6.5 feet these binoculars excel in both wide-area scanning and detailed close-up observations. Twist-up eyecups and a 16mm eye relief add comfort for extended viewing sessions. Specifications for Alpen Alpen Chisos Binoculars 1212930: Manufacturer: Alpen Color: Green Features of Alpen Alpen Chisos Binoculars: 10x magnification for long-range viewing 42mm objective lenses for bright and clear images ED glass for superior color accuracy and reduced chromatic aberration Waterproof and nitrogen-purged for fog-proof performance BK4 roof prism system with PXA phase coating for enhanced contrast Fully multi-coated (FMC) optics for maximum brightness and clarity Field of view: 305 feet at 1000 yards Apparent field of view: 7 degrees Close focus: 6.5 feet for detailed nearby observations 16mm eye relief for comfortable extended use 4.2mm exit pupil for optimal brightness Twist-up eyecups for adjustable eye positioning Durable magnesium housing with a textured grip Lightweight design at 759g Lifetime warranty with registration Package Contents: Alpen Alpen Chisos Binoculars