SPECIFICATION Magnification 10x-15x Front Lens Diameter, mm 50 Field of View (FOV) @ 1000yds, ft 274-208 Objective Angle of View, degrees 5.3'-4.0' Close Focus Distance, ft 12.9 Diopter Compensation, dpts '3 Eye Relief, mm 14.5 Exit Pupil, mm 5.0-3.3 Twilight Factor 22.4-27.4 Adjustable Interpupillary Distance, mm 59-74 Eyepieces for Eyeglass Wearers Yes Sliding Eyecups Yes (removable, with two click stops) Focusing Internal focusing via central focusing device Number of Lens Elements (Each Side) 11, all with HDC coating Prism System Roof prism with phase correcting coating P40 and HighLux-System (HLS) Watertightness Watertight to a depth of 5 m/16.5 ft Housing Die-cast aluminum, nitrogen-filled Dimensions (W x H x D), in 4.9" x 7.7" x 2.7" Weight, oz 44