The Diamondback HD is a great example of Vortexs commitment to pushing the price vs. performance envelope, delivering a rock-solid binocular that optically punches far beyond its class.SpecificationsMagnification 10 xObjective Lens Diameter 28 mmEye Relief 16 mmExit Pupil 2.8 mmLinear Field of View 273 feet/1000 yardsAngular Field of View 5.1 degreesClose Focus 6.0 feetInterpupillary Distance 55 72 mmHeight 4.6 inchesWidth 4.5 inchesWeight 13.5 ouncesOptical FeaturesHD Optical System Optimized with select glass elements to deliver exceptional resolution, cut chromatic aberration and provide outstanding color fidelity, edge-to-edge sharpness and light transmission.Fully Multi-Coated Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces.Dielectric Prism Coatings Multi-layer prism coatings provide bright, clear, colour-accurate images.ArmorTek Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt.Construction FeaturesRubber Armor Provides a secure, non-slip grip, and durable external protection.Waterproof O-ring seals prevent moisture, dust and debris from penetrating the binocular for reliable performance in all environments.Shockproof Rugged construction withstands recoil and impact.Fogproof Argon gas purging prevents internal fogging over a wide range of temperatures.Roof Prism Valued for greater durability and a more compact size.Convenience FeaturesAdjustable Eyecups Twist up and down to precise, intermediate settings to maximize custom fit for comfortable viewing with or without eyeglasses.Centre Focus Wheel Adjusts the focus of both binocular barrels at the same time.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.