Magnification:15, Effective objective lens diameter (mm) - 56; Exit pupil diameter (mm) - 3.7; Exit pupil distance (eye relief) (mm) - 16; Field of view (ft/1000 yds / m/1000 m) - 234/78; Field of view (degrees) - 4.5; Field of view for eyeglass wearers (degrees) - 4.5; Shortest focusing distance (ft / m) - 12.8/3.9; Weight approx. (oz/g) - 42.3/1200; Functional temperature - 13 degF to +131 degF (-25 degC / +55 degC); Submersion tightness - 13 ft / 4 m water depth (inert gas filling)