Specifications for Steiner 3-15x50 M5Xi Military Fogproof Riflescope: Magnification: 3x - 15x Objective Lens Diameter: 50mm Tube Diameter: 34mm Focal Plane: 1st Field of View @ 100 (M/Ft): 12.1-2.4 / 39.7-7.9 Eye Relief (mm/in.): 90/3.5 Exit Pupil (mm): 10.4-3.33 Length (mm/in.): 360/14.2 Weight *(grams/oz.) with caps: 920/32.5 Battery: CR2450 Diopter Adjustment Range: +2 to -3 Elevation Adjustment Knob: Duo Scale, resettable zero Windage/Elevation Adjustment Values: 1cm (0.1 mrad) Elevation Range @ 100M: 260cm (26 mils) Windage Range @ 100M: _/0 60cm (6 mills) Parallax / Focus Knobs: Side focus Parallax / Focus Range: 50M to infinity Operating Temperature: -25c to +63c Illumination Control: Rotary digital control, intermediate stops