Vortex Viper PST 4-16x50 Magnification 4-16x Objective Lens Diameter 50 mm Focal Plane Second Focal Plane Reticle EBR-1 (MOA) Eye Relief 4.0 inches Field of View 27.4-7.4 ft/100 yds Turret Style Tactical Tube Size 30mm Adjustment Graduation 1/4 MOA Travel Per Rotation 12 MOA Max Elevation Adjustment 75 MOA Max Windage Adjustment 75 MOA Parallax Setting 50 yards to infinity Length 13.7 inches Weight 22.4 oz