Vortex 10x42 Diamondback HD Binoculars. Designed for hunters, birders, and outdoor enthusiasts, the Vortex 10x42 Diamondback HD Binoculars deliver power, performance, and precision across all lighting conditions. The argon-filled, O-ring sealed optical tubes are fully waterproof and fog-proof, ensuring reliability even in harsh weather or accidental submersion. Optical performance: 10x magnification for detailed long-range observation, 42mm objective lenses for optimal brightness in dawn or dusk conditions, compact roof prism design for reduced bulk, phase-correcting prism coatings for enhanced color and contrast, dielectric prism coatings with over 99% reflectivity for maximum light transmission, and HD extra-low dispersion glass for superior edge-to-edge sharpness, reduced chromatic aberration, and accurate color rendition. Fully multicoated optics deliver high contrast and true color fidelity, while ArmorTek exterior coatings resist scratches and repel oil, dirt, and debris. With a close focus distance of 5 feet, the binoculars are ideal for observing birds, insects, and flora up close. A wide 63° apparent angle of view and 330-foot field of view at 1000 yards provide expansive, stable visuals with reduced handshake. Use and handling: closed-bridge configuration for stability, large slip-resistant center focus knob for precision control, right-eye diopter adjustment for individual focus correction, adjustable interpupillary distance (55–73 mm) for versatile fitting, twist-up click-stop rubber eyecups for comfort with or without glasses, tripod compatibility for steady viewing, 15mm eye relief to minimize eyestrain, and a 4.2mm exit pupil ensuring full image coverage in low light. Construction details: short bridge design for improved grip and handling, lightweight yet durable magnesium alloy chassis, rubber armor for impact resistance and a non-slip grip, O-ring sealed and argon-filled for waterproof and fog-proof performance, tethered lens caps and one-piece Rainguard for lens protection, and a GlassPak harness and case to secure the binoculars during active movement. MPN: DB-215, UPC: 875874009943.