Optical Performance High 10x power brings distant subjects in close for detailed observations 21mm objective lenses ensure a compact form factor for easy carrying and handling Roof prism optical path produces thin optical tubes Anti-reflection Multiguard multi-coatings maximize light transmission to improve color rendition, contrast, and clarity Apparent angle of view approaches wide angle to minimize the distracting hand shake that is common when holding high-power optics like this 303? field of view at 1000 yards. Use and Handling Closed-bridge/single-hinge design offers a stable platform for the internal focusing system Low-profile textured center focusing wheel is easy to manipulate Fast and smooth focusing mechanism allows you to go from its minimum to infinity quickly and easily ?4 right-eye dioptric adjustment enables tack-sharp focusing, even by those who wear eyeglasses Twist-up click-stop eyecups for comfortable use with or without eyewear 8mm eye relief 2.1mm exit pupil Construction Details Elegant and refined Black Pearl body-color Lightweight and durable aluminum-alloy chassis Compact 4.2?3.7? form factor easily fits into most packs, pockets, and purses Light 6.9-ounce weight won?t weigh you down or cause arm fatigue.