BDC 150 Reticle: Developed specifically for the trajectory of the .22 Long Rifle Rimfire round, the new BDC 150 reticle offers shooters unique open circle aiming points 50 to 150 yards. 50-yard Parallax Setting: Eliminates parallax for precise shooting. Precise, 1/4 inch @ 50 yd. Tactical Style Hand-turn Adjustments: Positive click reticle adjustments get you zeroed in quicker and maintain your setting—even with heavy recoil. Waterproof/Fogproof: Nitrogen filled and O-ring sealed. Fully Multicoated Optical System: Provides maximum light transmission and maximum brightness from dawn to dusk. Generous, Consistent Eye Relief: Allows maximum precision when changing magnifications. Zero-Reset Turret Feature: To simplify field adjustments, Nikon has integrated this feature into all new riflescopes. Just sight-in as usual, then lift the spring-loaded adjustment knob, rotate to your “zero”, and re-engage. Field adjustments are now as simple as dialing-in your subsequent ranges.