The Leupold VX-6 3-18X50mm side focus Fine Duplex riflescope features a quantum optical system, Xtended twilight lens system, DiamondCoat 2, argon/krypton waterproofing, a generous eyebox, pop-up rezero adjustments, blackened lens edges, twin bias spring erector system, extreme fast-focus eyepiece, and a custom dial system.