Nikon Prostaff 5 10x50 Binocular. This Binocular from the experts at Nikon Sport Optics features multilayer-coated lenses and Eco-glass with a body made of fiberglass-reinforced polycarbonate resin making them lightweight and durable enough for wherever your next adventure takes you. For a great way to make sure that you are completely aware of your surroundings choose the Nikon ProStaff 5 50mm Outdoor Binocular. Specifications for Nikon Prostaff 5 10x50mm Roof Prism Binoculars: Manufacturer: Nikon Color: Black Magnification: 10 x Objective Lens Diameter: 50 mm Prism System: Roof Prism Material: BAK-4 Eye Relief: 19.6 mm Exit Pupil: 5 mm Field of View Linear: 293 ft at 1000 yds Field of View Angle: 5.6 degrees Optical Coating: Multi-Layer Coated Binoculars Focus System: Center Focus Twilight Factor: 22.4 Interpupillary Distance: 2.2 - 2.89 mm Close Focus: 16.4 ft Diopter Adjustment Range: -2 - 2 dpt Weather Resistance: Fog Resistant Water Resistance Level: Waterproof Length: 3.9 in Weight: 39.04 oz Fabric/Material: Fiberglass-Reinforced Polycarbonate Resin Magnification Type: Fixed Eyecups Types: Turn-and-Slide Fogproof: Yes Brightness Index: 25 Objective Lens Material: Lead and Arsenic Free Eco-Glass Features of Nikon 10x50mm ProStaff 5 Binocular: Lightweight Durable Eco-Glass Large Objective Lens Fiberglass-Reinforced Polycarbonate Resin Package Contents: Nikon ProStaff 5 10x50mm Binocular Nikon 7572: Prostaff 5 10x50 Binocular