Vortex Viper HD 10x42 Roof Prism Binocular The Viper HDs significantly step up their game in 2011 with HD (High Density) extra-low dispersion glass. One look is all you"ll need to appreciate why the Viper is an award-winning bino. Add XR fully multi-coated lenses and you have a bino that delivers bright, crisp details with impressive resolution and color fidelity. Rugged, compact and lightweight—one of the lightest full-size binos available. It"s no mystery why the Vipers are an award-winner, our Viper HD binoculars pack in all the features you need for a successful hunt. See what premium optics can do for you! Optical Features HD Lens Elements HD (High Density) extra-low dispersion glass delivers impressive resolution and color fidelity, resulting in High Definition images. XR Lens Coatings Vortex proprietary XR anti-reflective coatings, fully multi-coated on all air-to-glass lens surfaces, increase light transmission for maximum brightness. Phase Correction Used on roof prism models only—coating enhances resolution and contrast. Construction Features Roof Prisms Valued for greater durability and a more compact size. Ergonomic open-hinge design. Waterproof Optics are sealed with O-rings to prevent moisture, dust, and debris from getting inside the binocular. Fogproof Argon gas purging guarantees superior fogproof and waterproof performance. Rubber Armor Provides a secure, non-slip grip, and durable external protection. ArmorTek Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. Convenience Features Twist Eyecups Twist up and down to precise, intermediate settings to maximize custom fit for comfortable viewing with or without eyeglasses. Center Focus Wheel Adjusts the focus of both binocular barrels at the same time. Locking Diopter Adjusts for differences in a user"s eyes. Located on the right eyepiece. Tripod Adaptable Compatible with a tripod adapter, allowing use on a tripod or car window mount. * High Density ED Glass * Phase Correction * Waterproof and Fogproof * Twist-up Eyecups * Locking Diopter adjustment