"The Razor HD 10x42 Roof Prism Binocular from Vortex Optics is designed to deliver high quality images. Vortex Optics is committed to consistently produce an apex product to satisfy the demands of the connoisseurs. The Razor HD 10x42 binocular is the perfect tool for numerous recreational activities. It is well suited for short or long distance observation. Its lightweight construction and high optical performance make it an extremely desirable viewing instrument.The binocular renders significantly high contrast and color accuracy because of its HD extra-low dispersion glass elements for enhanced image resolution. The optics are carefully selected and precision-crafted to exacting standards for true-to-life images of clarity and color accuracy. The proprietary Vortex Optics XR lens coatings on all air-to-glass surfaces deliver detailed images. Phase-correction for these Roof Prism binoculars enhances contrast and resolution.The HD optical design is an advanced optical configuration that virtually eliminates chromatic aberrations and provides distortion-free, flat field images with unmatched edge-to-edge sharpness. Additional lens protection from scratches, oil and dust is provided by Armor Tek exterior lens coating. The Razor HD 10x42 Roof Prism Binocular is argon gas purged and sealed with O-rings to ensure reliable and durable protection against dust, debris, fog and water.It is rubber armored for non-slip and durable protection. It is also equipped w|HD Lens Elements: Premium (High Density) extra-low dispersion glass delivers the ultimate in 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|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|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 the center focus dial|Tripod Adaptable: Compatible with a tripod adapter, allowing use on a tripod or car window mount"