Redesigned Vortex Viper HD binoculars are premium optics with rugged construction in a compact, lightweight package. Updated features include a wider field-of-view, improved ergonomics with comfortable thumb grooves and enhanced eyecups, a shorter hinge to allow a better grip, and a quality chest harness included.SpecificationsMagnification 10 xObjective Lens Diameter 42 mmEye Relief 17 mmExit Pupil 4.2 mmLinear Field of View 341 feet/1000 yardsAngular Field of View 6.5 degreesClose Focus 6.5 feetInterpupillary Distance 56 75 mmHeight 5.6 inchesWidth 4.9 inchesWeight 24.9 ouncesOptical FeaturesHD Lens Elements HD (High Density) extra-low dispersion glass delivers impressive resolution and colour fidelity, resulting in High Definition images.XR Fully Multi-Coated Proprietary coatings 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.Phase Correction Coating on roof prism models enhances resolution and contrast.Construction FeaturesRoof Prism Valued for greater durability and a more compact size.Waterproof O-ring seals prevent moisture, dust and debris from penetrating the binocular for reliable performance in all environments.Fogproof Argon gas purging prevents internal fogging over a wide range of temperatures.ArmorTek Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt.Rubber Armor Provides a secure, non-slip grip, and durable external protection.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.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.