The Diamondback —loaded with features! First, the solid one-piece aircraft-grade aluminum alloy construction makes the Diamondback riflescope virtually indestructible and highly resistant to magnum recoil. Argon purging puts waterproof and fogproof performance on the agenda, and advanced fully multi-coated optics raise an eyebrow when crystal clear, tack-sharp images appear in the crosshairs. Look for all this and more in a riflescope you'd expect to cost quite a bit more-but doesn't. We can live with that. Magnification: 4-12 x Objective Lens Diameter: 40 mm Eye Relief: 3.1 inches Field of View: 32.4-11.3 feet/100 yards Tube Size: 1 inch Turret Style: Capped Adjustment Graduation: 1/4 MOA Travel Per Rotation: 15 MOA Max Elevation Adjustment: 60 MOA Max Windage Adjustment: 60 MOA Parallax Setting: 100 yards