The Mark 6's powerful zoom range offers an incredible field of view and rapid target acquisition at lower magnifications, and excellent long range target engagement at higher powers, all in a package that is less than 12 inches long. Leupold's legendary Xtended Twilight Lens System offers crystal clear images from edge-to-edge throughout the entire zoom range, while DiamondCoat2 provides unsurpassed scratch resistance and increased light transmission. A locking fast-focus eyepiece ensures a generous eyebox and optimal diopter adjustment in the field while a durable 34mm maintube creates over 26 milliradians of total elevation adjustment. Leupold's M5C2 ZeroLock, 1/10th mil per click elevation adjustment make precise corrections easy, and eliminates accidental movement in the field. The elevation dial features a two turn zero stop with a tactile revolution indicator, providing 20 mils of travel (10 mils per revolution) and eliminates under or over rotating the dial.