Celestron SkyMaster Pro 20x80mm Porro Prism Binoculars Black. The built in tripod adapter on this impressive Binocular from the optical experts at Celestron not only allow the it to be attached to a tripod for added stability but it also acts as a balance rail by sliding along the center support rod. A red-dot finder can also be attached to the center support rod utilizing the removable rail. When properly aligned with the binocular the red-dot finder will allow objects to be brought into view quickly. The polycarbonate and aluminum material that houses the Celestron Skymaster Pro Binocular allows it to be lighter weight without sacrificing its durability. The housing with protective rubber armor is extremely rugged and durable with the ability to handle tough use. Every air-to-glass surface of the Celestron 20x80mm Sky Master pro Binocular is multi-coated with a proprietary XLT coating technology. These coatings coupled with BaK-4 prisms increase light transmission through the optical path and deliver crisp high contrast images with outstanding resolution. For an amazing way to make sure you are looking through some of the best optics the binocular industry has to offer choose the Celestron Pro SkyMaster 20x80mm BAK4 Prism Binocular. Specifications for Celestron SkyMaster Pro 20x80mm Porro Prism Binoculars: Manufacturer: Celestron Color: Black Magnification: 20 x Objective Lens Diameter: 80 mm Prism System: Porro Prism Material: BAK4 Eye Relief: 15.5 mm Exit Pupil: 4 mm Field of View Linear: 168 ft at 1000 yds Field of View Angle: 3.2 degrees Optical Coating: Fully Multi-Coated - XLT Coatings Binoculars Focus System: Center Focus Twilight Factor: 40 Interpupillary Distance: 56 - 72 mm Close Focus: 65.6 ft Diopter Adjustment Range: + - - dpt Weather Resistance: Rain Resistant Fog Resistant Water Resistance Level: Waterproof Length: 13 in Weight: 5.4 lb Package Type: Box Additional Features: Built in tripod and Reflex Sight Ready Rail Included Accessories: Objective Lens Caps Instruction Manual Lens Cloth Rainguard Neck Strap Reflex Sight Rail Tripod Adapter Interchangeable Flared Eyecups Magnification Type: Fixed Width: 9.5 in Case: Yes Tripod Adaptable: Yes Nitrogen Filled: Yes Brightness Index: 16 Height: 4 in Armoring: Rubber Armored Fogproof: Yes Features of Celestron Skymaster Pro Astronomy Binocular - 20x80mm: Massive objective lens Fully multi-coated optics BAK-4 Prisms Compatible with astronomical filters Built in tripod and Reflex Sight Ready (RSR) Rail Lightweight waterproof construction Enhanced Magnification Package Contents: Celestron 20x80mm Skymaster Pro Astronomy Binocular 72031 Built in Tripod Adapter Finder Rail Objective Lens Caps Rainguard Neck Strap Lens Cloth Instruction Manual Celestron 72031: SkyMaster Pro 20x80 Binoculars