Vortex 10x42 Viper HD Binoculars. The 2018 edition of the Vortex Viper HD 10x42 binoculars features high 10x magnification and 42mm objective lenses for enhanced light gathering and improved low-light performance. The HD extra-low dispersion (ED) glass and XR fully multi-coated optics reduce chromatic and spherical aberrations for sharp, high-contrast views with accurate color rendition. Dielectric and phase-corrected prism coatings boost reflectivity and transmission, while ArmorTek coatings protect lenses from scratches, oils, and dirt. The binoculars provide a wide 65° apparent angle of view and 341-foot field of view at 1000 yards. Use and handling features include a 56-75mm interpupillary distance, twist-up click-stop rubber eyecups, 17mm eye relief, 4.2mm exit pupil, and tripod mountable with an optional adapter. Construction details include a lightweight, impact-resistant polycarbonate chassis, rubber armoring, O-ring sealed and argon-filled for waterproof and fog-resistant performance, tethered objective lens caps, and a GlassPak harness. Package includes the Vortex 10x42 Viper HD Binoculars, Vortex GlassPak binocular harness, neck strap, rainguard eyepiece cover, 2 tethered objective lens covers, limited lifetime warranty, and Vivitar professional cleaning kit with hard carrying case, cleaning cloths, air blower, lens cleaner, sensor swab, lens tissue paper, cleaning pen, and brush. MPN: V201-1K UPC: 875874007420