The folks at Nightforce designed the TS-82 to give the same optical clarity as shooters have come to expect from their rifle scopes. It produces vivid, high-contrast images with razor-sharp resolution and no distortion from edge to edge - even at the top of its 20-70x magnification range. The 82mm objective lens ensures exceptional low-light performance, and an internal prism system provides maximum light transmission, unlike mirrors that can absorb critical light. Lens is ground from high-grade APO (apochromatic) fluorite glass for exceptionally true, brilliant color. Nightforce's proprietary coatings - same as used on their rifle scopes - result in superb contras Mfg: Nightforce SPECS: Straight model is 16.4" OAL. Angled is 15.9" OAL. Eye relief: 18mm. 67 oz. approx. wt.