Vortex Razor HD 12X50 BinocularsExtreme terrain. Unimaginable condiitons. Both test your mettle, and your optics. With a well earned reputation for pushing the limits of optical performance, the Razor HDs step up and out on other binoculars in their class. Small, light, bright, strong, and packed with the best quality, hand selected prisms and premium HD extra low dispersion glass available today. Nothing else comes close! OPTICAL APO Optical System Combines with HD (High Density)