Bushnell 12×50 Powerview Binoculars are great for examining detail at long range. Ideal for astronomical use.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. Features: 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-Focus Adjustable diopter Porro Prisms