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Extra-low dispersion (ed) glass produces outstanding color fidelity and high quality image bak-4, phase coated roof prisms 100% fully multi-coated optics, green-coated on four sides of the prisms and large aperture apochromatic lens, higher image quality in all lighting conditions , even water-repellent coatings for the lenses armored rubber binocular long eye relief and twist up eyecups great for eyeglass wearers minimum focus distance of 3.92 ft. magnesium alloy body provides light weight fully waterproof and fog proof, nitrogen filled, submerge to 1 meter for 15 minutes wide field of view at 1000 yards. 361.6 ft. Ergonomic open hinge design specifications: binoculars series knight ed-series binoculars focus system central lens ed (extra-low dispersion glass) prism system dash (bak-4) coating fmc (fully-multi coated) resolution 5 size full size binoculars eye relief 20.34 mm waterproof yes fog-proof yes features waterproof magnification 8 x brand Snypex objective lens diameter 50 mm field of view at 1000 yards 361.6.ft.