Fully coated optics and BK7 prisms. Protective rubber covering. Water resistant body and nylon carrying case. Diopter adjustment for fine focusing. Molded finger impressions and embossed logos for a firm grip. Tripod adaptable. No fault lifetime warranty. 7 x 35 - 8° angular field of view, 419' linear FOV, 5 mm exit pupil, 11 mm eye relief, 15' near focus.|10 x 50 Wideangle - 7° angular field of view, 367' linear FOV, 5 mm exit pupil, 11 mm eye relief, 24' near focus.|20 x 50 - 3.2° angular field of view, 168' linear FOV, 2.5mm exit pupil, 7mm eye relief, 36' near focus.