Nikon Monarch 5 20x56 Binocular. This Binocular from Nikon Sport Optics features the largest objective lenses found in a pair of Nikon roof prism binoculars. Equipped their Extra-Low Dispersion (ED) glass the Nikon Monarch 5 20x Binocular won't weigh users down despite it's size. The Nikon Monarch 5 56mm Binoculars take vision to a whole new level of clarity and realism. Specifications for Nikon Monarch 5 Binocular - 20x56mm: Manufacturer: Nikon Color: Black Magnification: 20 x Objective Lens Diameter: 56 mm Prism System: Roof Prism Material: BAK4 Eye Relief: 16.4 mm Exit Pupil: 2.8 mm Field of View Linear: 173 ft at 1000 yds Optical Coating: Fully Multi-Coated Binoculars Focus System: Center Focus Close Focus: 16.4 ft Water Resistance Level: Waterproof Length: 9.37 in Weight: 43.6 oz Condition: New Magnification Type: Fixed Tripod Adaptable: Yes Fogproof: Yes Objective Lens Material: Eco-Glass Eyecups Types: Turn-and-Slide Features of Nikon 20x56mm Monarch 5 Binocular: Lightweight Durable Extra-Low Dispersion Glass Large Objective Lens Package Contents: Nikon Monarch 5 20x56mm Binocular 7583 Nikon 7583: Monarch 5 20x56 Binocular