Vortex's Viper HD Spotting Scopes deliver incredible views at your fingertips. For big country hunting, the Vortex Viper Spotting Scope features HD extra-low dispersion glass for impressive resolution, and XR multi-coated lenses for maximum brightness. Optical quality is further enhanced with the porro prism with dielectric prism coatings, and ArmorTek lens coatings repel water, dirt, and oils to keep your view clear. Additioal features include an adjustable eyecup, dual focus, a built-in sunshade, rotating tripod ring, and picatinny rail.