"The Vortex Optics Razor HD 12x50 Roof Prism Binocular features a magnesium chassis that decreases the weight and increases the strength. With a well-earned reputation for pushing the limits of optical performance, the Razor HDs step up and out on other binoculars in their class. The Vortex Optics Razor HD Binocular is small, light, bright, strong and packed with the best quality, hand-selected prisms and premium HD extra-low dispersion glass available today. The multi-position eyecups allow you to twist up and down to precise, intermediate settings to maximize custom fit for comfortable viewing with or without eye glasses. Nothing else comes close to the Vortex Optics Razor-HD 12 x 50 Binocular.|APO Optical System: Combines with HD (High Density) glass for unmatched color sharpness|Plasma Tech: Cutting edge application process provides unparalleled coating durability and performance|HD Lens Elements: Premium (High Density) extra-low dispersion glass delivers the ultimate in resolution and color fidelity, resulting in High Definition images|Dielectric Prism Coatings: Multi-layer coatings provide the clearest, brightest, most color-accurate images possible|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|Roof Prisms: Valued for greater durability and a more compact size. Ergonomic open-hinge design|Magnesium Chassis: Decreases weight and increases strength|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|True Open Hinge: Offers superior ergonomics while decreasing total weight and bulk|Multi-Position 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 right eyepiece|Tripod Adaptable: Compatible with a tripod adapter, allowing use on a tripod or car window mount"