Sight picture remains perfectly circular, with crisp, edge-to-edge sharpness across the entire visual field The Xtended Twilight Lens System optimizes the transmission of low-light wavelengths DiamondCoat 2 lens coatings on exterior lens surfaces provide the highest level of scratch resistance The twin bias spring exerts up to 30 percent more holding force on the erector, virtually eliminating erector system backlash and stress on the vital internal workings of the scope Backened lens edges reduce light diffusion, so more usable light reaches the shooter's eye, for a brighter image with increased contrast Tactile power indicator also features built-in range estimation functions and graphite O-rings for easy operation Internally threaded, lockable, extreme fast-focus eyepiece with Alumina rubber eyepiece guard Rugged and waterproof ** BLEMISHED products may or may not include accessories. Image may not represent the exact product number.