Knight D-ED 8x42 Dielectric Optical Binocular is a compact fog and waterproof binocular with an outstanding close focus of just 5.56 ft. It features Bak-4 prisms with precision crafted ED glass. Fully multi-coated optics and phase correction coatings 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 D-ED Binoculars are protected with a durable armored rubber housing to absorb shocks.