High reflection mirror-coated prisms for enhanced brightness. FOV at 1000 yds : 315 feet Long eye relief design ensures a clear field of view, even for eyeglass wearers Turn-and-slide rubber eyecups with a multi-click adjustment make it easy to correctly position the eye Extremely lightweight with rubber armouring for shock resistance and a firm, comfortable grip Waterproof (up to 1m/3.3 ft. for 10 minutes) and fog-free with nitrogen gas Item weight: 420 grams