Leupold's Guard-ion lens coating shed water and dirt, keeping your target clear even when the weather isn't, while Leupold's Twilight Max HD light management system delivers the maximum amount of usable light to your eye for unmatched low-light performance and clarity. With the two-turn CDS ZeroLock 2 adjustment (Leupold's one-of-kind Custom Dial System), you'll have the confidence to take long-range shots without worrying about holdovers. Take this riflescope out for the day, and you'll quickly realize the VX-5HD is the lightest, most rugged 5:1 riflescope in its class.2nd Generation Argon/Krypton WaterproofingGenerous EyeboxFireDot IlluminationTwin Bias Spring Erector SystemMST (Motion Sensor Technology)30mm MaintubeSide Focus6061-T6 Aircraft Quality AluminumPush Button IlluminationTwilight Max Light Management SystemGuard-Ion Rain Shedding CoatingCDS-ZL2 Zero Lock Adjustment with Revolution Indicator5:1 Zoom RatioPop Up Rezero Windage Adjustment