Nikon 1-4x20 Matte BDC 600 Features the BDC 600 Reticle with open circle aiming points and hash marks from 100 to 600 yards Adjustments are made easy with Spring-Loaded Instant Zero-Reset Turrets Ultra ClearCoat Optical System for up to 95% light transmission Utilizes Nikon's Eye Box Technology with 4-time zoom and 4-Inch of constant eye relief Optimized for use with Nikon's Spot On Ballistic Match Technology