Nikon 7x50CF WP Compass

Key Features : Central focusing system; waterproof ( up to 1m/ 3.3 ft. for 5 minutes) and fog-free with O-ring seals and nitrogen gas Built-in compass with illuminator and scale ( 7x50CF WP Compass) High-eyepoint design for a clear field of view even for wearers of eyeglasses Multilayer-coated lenses for a bright image Rubber armouring for shock resistance and a firm, comfortable grip Floating strap provided Can be fixed to a tripod using optional tripod adaptor Compass and distance scale( for 7x50CF WP Compass) You can measure dimensions or distances if you know one of the values. For : [ Marine sports, fishing] [ For eyeglass wearers] Specification : Magnification ( x) : 7X Objective diameter ( mm) : 50mm Angular field of view ( Real/ degree) : 7.2 Angular field of view ( Apparent/ degree) : 47.5 Field of view at 1, 000m ( m) : 126 Exit pupil ( mm) : 7.1 Relative brightness : 50.4 Eye relief ( mm) : 22.7 Close focusing distance ( m) : 10.0 Weight ( g) : 1, 120 Length ( mm) : 193 Width ( mm) : 202 Interpupillary distance adjustment ( mm) : 56-72