Redfield Revolution 4-12x40mm Riflescope with Accu-Range Reticle, Matte Black Magnification: 4-12x, Objective lens: 40mm, Main tube diameter: 1" Accu-Range reticle: Circle-crosshair pattern with secondary aiming point for bullet drop compensation Eye relief: 3.7-4.9", Multicoated Illuminator Lens System 1/4 MOA impact point correction, Accu-Trac finger-adjustable turret, Rapid Target Acquisition eyepiece with lockable setting Weight: 13.1 oz, Nitrogen-filled for fogproof and waterproof performance