Versatile 5:1 zoom ratio gives you 5 times more magnification at high power than at low power; Professional-Grade Optical System offers unmatched light transmission that's designed to outperform in the most challenging lighting conditions; Guard-ion is a hydrophobic lens coating that sheds dirt and water for a maintenance-free, clear, crisp image; High-Definition lenses provide unparalleled clarity, color, and image resolution at all magnification levels; Innovative SpeedSet dial eliminates the need for tools when zeroing or changing custom dials; Leupold's Custom Dial System gives you the ability to customize your turret (adjustment dial) to your exact ballistics and environmental conditions; ZeroLock system eliminates accidental dial movement by locking it in place and allows for repeatable returns to zero