The Vortex Diamondback 20-60x80 Spotting Scope features optics that are sealed with o-rings to prevent moisture, dust, and debris from getting inside the spotting scope. Nitrogen gas purging delivers fogproof, and waterproof performance to the Vortex Diamond Back Waterproof Spotting Scope. Born into the bloodline of the popular Diamondback family, this all-new spotter delivers outstanding performance-clearly a superb choice when you need a heavyweight performer in a light, compact package. The Diamondback optics guarantee a bright image throughout the magnification range and, as true to all Diamondback optics, the rugged construction stands up to rough use in the field. Vortex propietary XR anti-reflective coatings, fully multi-coated on all air-to-glass lens surfaces, increase light transmission for maximum brightness with your Vortex Diamondback Spotting Scope.