PROSTAFF 3S 10x42 - Magnification: 10x - Objective diameter: 42mm - Angular field of view: 6.2 Degrees (Real) - Angular field of view: 56.9 Degrees (Apparent) - Field of view at 1000m: 108m - Exit pupil: 4.2 mm - Relative brightness: 17.6 - Eye relief: 15.5 mm. Close focusing distance: 4 m - Length: 164 mm - Width: 129 mm - Depth: 55 mm - Weight: 645 g - Interpupillary distance adjustment: 56mm-72mm - All lenses and prisms are multilayer-coated for bright images - Phase-correction-coated roof prisms for high resolution - High-reflection mirror-coated prisms for bright images - Long eye relief design ensures a clear field of view even for eyeglass wearers - Turn-and-slide rubber eyecups with multi-click facilitate easy positioning of eyes at the correct eyepoint - Waterproof (up to 1m/3.3 ft. for 10 minutes) and fog-free with nitrogen gas - Rubber armouring for shock resistance and a firm comfortable grip - Lightweight body uses fibreglass-reinforced polycarbonate resin - Eco-glass optics that are free of lead and arsenic are used for all lenses and prisms. - Nikon binoculars have established a benchmark for extraordinary value by which all others are compared. Most models feature Nikon multilayer-coated lenses of the highest quality to provide astonishingly bright razor-sharp images. All models feature rugged construction and finely tuned ergonomic engineering for comfortable handling during long hours of use. Whatever your passion - be it birdwatching rugby an ocean crossing or a night at the opera - Nikon has the ideal binoculars for you.