The Viper HD?a premium-quality binocular packed with everything you need and nothing you don't. Rugged, compact and lightweight (one of the lightest full-size binoculars to date), it's easy to see why the Vipers are award winners. Add in HD (High Density) extra-low dispersion glass for impressive resolution and color fidelity and the Vipers change more than the game. They change the results, tooMagnification: 10 xbrObjective Lens Diameter: 42 mmbrEye Relief: 16.5 mmbrExit Pupil: 4.2 mmbrLinear Field of View: 319 feet/1000 yardsbrAngular Field of View: 6.1 degreesbrClose Focus: 5.1 feetbrInterpupillary Distance: 59-75 mmbrHeight: 5.8 inchesbrWidth: 5.3 inchesbrWeight: 24.6 ounces