Detailed Product Description WeatherproofingWaterproof & fogproofPrism Type RoofMagnification10xObjective Diameter, mm 25Angle Of View, degrees5.0Weight, lb/g 0.93/420.0Field of View at 1000 Yards262'Minimum Focus Distance, ft/m 9.8/3.0Exit Pupil Diameter, mm2.5Relative Brightness6.3Eye Relief, mm15.0Twilight Factor15.8Focus TypeCenter