Nikon 3-9x40 BUCKMASTERS II Matte BDC - Magnification: 3x - 9x - Objective Diameter: 40mm - Exit Pupil: 4.4-13.3mm - Field of View: 11.9-35.7 ft @ 100 yds - Tube Diameter - Other: 1 in - Eye Relief: 3.6in - Objective Outside Diameter: 49.3mm - Eyepiece Outside Diameter: 43mm - Weight: 16.1 oz - Overall Length: 13.1 in - Adjustment Graduation - Other: 1/4 in - Max Internal Adjustment: 80 MOA - Parallax Setting - Other: 100 yds - Waterproof/Fogproof: Yes - Light Transmission - Other: Up to 92% - Patented BDC reticle: The BDC reticle allows hunters to hold 'dead-on' at ranges exceeding those previously thought possible. The BDC’s unique see-through ballistic circles offer an incredible advantage for long range shooting—yet allow a normal sight picture for shorter-range shots where the crosshair itself is the aiming point. - Large exit pupils: Improved low light hunting at dawn or dusk when the game is usually moving. - Quick focus eyepiece: Allows the shooter to instantly bring the reticle into sharp focus. - Waterproof fogproof shockproof: Nitrogen filled and O-ring sealed. - Brightvue multicoating: Bright multicoating optics deliver up to 92% light transmission. - Precise hand-turn 1/4-MOA click adjustments: Positive-click reticle adjustments get you zeroed-in quicker and maintain your setting even with heavy recoil. - Sunshade adaptable: Optional accessory sunshade eliminates glare in particularly bright conditions and keeps dust and rain off of the objective lens on rainy days or in dusty environments.