The Burris Fullfield IV 3-12x56mm has large light gathering objective lense when maximum low light visibility is a must. Features an illuminated Ballistic E3 reticle and 30mm tube for more adjustment range. Brand Burris Category Rifle Scopes Focal Plane Rear Model Fullfield Series IV Finish Matte Black Magnification 3-12x Firearm Type Rifle Reticle Illuminated Ballistic E3 Objective 56mm Tube Diameter 30mm Windage Adjustment 100 MOA Length 14.50" Adjustment Size .25 MOA Elevation Adjustment 100 MOA Exit Pupil Diameter 13.70-5.40mm Eye Relief 3.5"-3.8" Field of View 40-10 ft @ 100 yds Optic Coating Hi-Lume Weight 24 oz Windage Elevation Adjustable