018208082186 NK8218 Nikon Trailblazer Binocular, 10X25mm, Roof Prism, Black Finish 8218NK8218 018208082186 Magnification 10x Objective Lens Diameter, mm 25 Field of View (FOV) @ 1000yds, ft 342 Angular Field of View (Real), degrees 6.5° Angular Field of View (Apparent), degrees 59.2° Eye Relief, mm 10 Exit Pupil, mm 2.5 Close Focus Distance, ft 11.5 Relative Brightness 6.3 Interpupilary Distance 56-72 Waterproof / Fogproof Yes Focusing System Central Focus Prism Type Roof Size (L x W), in 4.1″ x 4.5″ Weight, oz 9.9 TRAILBLAZER ATB 10X25 BLK Waterproof/Fogproof Rubber Armored Body Turn-and-Slide Eyecups Dual-hinge design