The SNYPEX Knight ED 10×50 Optical Binocular is a compact fog and waterproof binocular that features Bak-4 prisms with precision-crafted ED glass. Fully multi-coated optics and phase correction coating enable a wide field of view. This binocular delivers true-to-life images with startling clarity color accuracy and excellent brightness in all environments. All SNYPEX Knight ED Binoculars are protected with a durable armored rubber housing to absorb shocks. Features 309.20 ft. wide field of view at 1000 yards.