Large 12x magnification for long-range viewing and generous 50mm objective lenses increase light gathering and viewing comfort. Porro prisms offer fantastic light transmission. Insta-Focus system allows for rapid and accurate focus. The rugged construction will serve you for years to come. Great for examining detail at long range, with 12x magnification. Multi-Coated Optics - Multiple layers of coatings on lens surfaces increase light transmission, color rendering, contrast, and image brightness. Insta-FocusAdjustable diopterPorro Prisms Bushnell Powerview 12x50mm Black Binoculars 131250