Simple perfection. The Vortex Razor HD Spotting Scope features the triplet apochromatic lens system for high-definition views, HD extra-low dispersion glass, ArmorTek scratch-resistant coating, XR fully multi-coated lenses, die-cast magnesium alloy body, rubber armor, dielectric prism coatings, plasma tech cutting, porro prism, o-ring seal, argon gas purging, adjustable eyecup, dual focus, built-in sunshade, and rotating tripod ring. No color fringing, degradation of resolution, or dilution of color fidelity even at long viewing distances.