The Viper HD Premium optics and rugged construction in a tremendously compact, lightweight package What more could you need? Well, perhaps a quality chest harness to comfortably and securely carry your investment in the field, but that s included, too! Hunters, shooters and outdoor enthusiasts alike are sure to benefit from the high performance of the Viper HD binoculars. Product Specifications Magnification: 10 x Objective Lens Diameter: 42 mm Eye Relief: 17 mm Exit Pupil: 4.2 mm Linear Field of View: 341 feet/1000 yards Angular Field of View: 6.5 degrees Close Focus: 6.5 feet Interpupillary Distance: 56-75 mm Height: 5.6 inches Width: 4.9 inches Weight: 24.9 ounces