Celestron Skymaster Pro 20x80 Binocular

{Description}Large 80 mm objective lenses for excellent light gathering in low light conditions or for astronomical observing
Detachable RSR rail for attaching an optional red dot finderscope
Rubber armored for improved ergonomics and protection from every day use in the field
Waterproof and nitrogen purged for use in all weather conditions

{Specification}
Magnification: 20x
Objective Lens Diameter: 80mm (3.15")
Focal Length of Objective Lens: 329.15mm (12.96")
Angular Field of View: 3.2°
Linear Field of View (@1000 yds) / @1000 m): 168 ft (56 m)
Exit Pupil: 4mm (.15")
Eye Relief: 15.5mm (.61")
Close Focus: 66.2 ft (20.2 m)
Interpupillary Distance (max): 72mm (2.83")
Interpupillary Distance (min): 56mm (2.20")
Diopter Adjustment Range: ±4
Twilight Factor 40
Relative Brightness: 16
Limiting Stellar Magnitude: Ideal: 12.02 | Moderate: 11.02 | Poor: 10.02
Lens Coatings: Fully Multi-Coated - XLT Coatings
Prism Glass (Type): BaK-4
Prism Coatings: N/A
Weight: 86.4 oz (2449 g)
Environmental Protection: Waterproof
Nitrogen Filled: Yes
Tripod Adaptable: Yes
Carrying Case: Deluxe Nylon
Dimensions: 330.2mm x 241.3mm x 101.6mm (13" x 9.5" x 4")
Included Items: Reflex Sight Rail (RSR)
Objective lens caps
Interchangeable flared eyecups
Rainguard
Neck strap
Lens cloth
Instruction manual