Leupold's optical engineers have created this radical design that forms a small crescent in the lower radius of the objective lens. This allows the VX-L to gather large amounts of light with its large objective lens while still mounted very low, close to the barrel for improved accuracy and a more comfortable shooting position. A VX-L with a 56mm objective lens can be mounted as low a regular scope with a 40mm lens. Scope Features: 1/10 MOA windage and elevation adjustments Leupold Index Matched Lens System with DiamondCoat Argon/Krypton-filled 98% light transmission Lockable fast focus eyepiece Waterproof, fogproof, shockproof Leupold's Full Lifetime Guarantee