The Viper HD 12x50mm binoculars feature Vortex’s advanced roof prism technology, combined with high resolution, extra-low dispersion lenses to deliver a bright, crystal-clear image with superb detail. A high-tech phase correction coating produces enhanced contrast, increased light transmission, and maximum brightness. The view through Viper HD binoculars is breathtaking! The sturdy housing of the Viper HD 12x50 is rubber armored for a secure, non-slip grip and protection of the internal components from shock and impact. Adjustable eyecups let you set up a comfortable fit with or without eyeglasses. The diopter focus can be set differently on the left and right side to compensate for differences between the user’s eyes, while the large, smooth-operating center wheel adjusts the main focus. High-density, extra-low dispersion lenses for super-detailed resolution & excellent color fidelity Full multi-coatings deliver the highest level of light transmission & brightness O-ring sealed, Argon-purged body for waterproof & fogproof performance ArmorTek coating protects exterior lenses from scratches 10' minimum focus distance Rugged, compact, and lightweight, Vortex Viper HD 12x50 are among the lightest full-size binoculars available. Compatible with tripod adapter. Also available with 8x, 10x and 15x magnification; see separate listings.