The Nikon(R) Aculon 10-22x50 Binoculars are extremely versatile with a lightweight, ergonomic design. The Aculon features multilayer-coated optics with Eco-Glass and the BaK4 Porro prism system that delivers high quality images in numerous lighting conditions. They have a quick, easy central focus and turn-and -slide eyecups for comfort. The binoculars include a tripod adapter for prolonged observation of wildlife. FEATURES: Multilayer-coated optics Fully rubber armored Tripod adaptable Quick, easy central focus Includes free tripod adapter Model: 6489 SPECS: Magnification: 10-22x Angular Field of View (Real): 3.8deg Angular Field of View (Apparent): 36.7deg Objective Diameter: 50mm Field of View ft@1000yds: 199 ft. Exit Pupil: 2.3-5mm Eye Relief: 8.6mm @ 10x Close Focus: 49.2 ft. @ 10x ft. Relative Brightness: 25 @ 10x Dimensions: 7.8"L x 7.8" W Weight: 33.9 oz.