The Fullfield IV 4-16x50 is designed to make longer shots possible. During a hunt there is no substitute for accuracy. The illuminated reticle keeps your hunt going as lighting conditions change. Bad weather and elusive game are no match for the Fullfield IV. The rugged and lightweight Fullfield IV features premium coated lenses for low-light performance and edge to edge clarity. The nitrogen filled 1" tube is water and fog proof. The Fullfield IV can handle the recoil of all you platforms from high caliber rifles, slug guns, and air rifles.Specifications and Features: Burris Item Number 200492 Magnification 4-16x50 Exit Pupil Diameter 3.4mm @16x 10.8mm @ 4x Objective Lens 50mm 1" Tube Rear Focal Plane Parallax Adjustment 10 yards - Infinity 4x Field of View @ 100 yards = 26' 16x Field of View @ 100 yards = 6.5' Eye Relief 3.5"-3.9" Illuminated E3 MOA Reticle 1/4 MOA Adjustment Length 12.4" Weight 21.6 oz Nitrogen Filled Waterproof and Fogproof Matte Black Finish