Celestron SkyMaster 12x60mm Porro Prism Binoculars Black. The Celestron 12x60 SkyMaster Porro Prism Large Aperture Binoculars are also a great choice for terrestrial use especially over long distances. The Celestron 12x60 Sky Master Binoculars feature high quality BAK-4 prisms and have multi-coatings for enhanced contrast. Specifications for Celestron SkyMaster 12x60mm Porro Prism Binoculars: Manufacturer: Celestron Color: Black Magnification: 12 x Objective Lens Diameter: 60 mm Prism System: Porro Prism Material: BAK4 Eye Relief: 18 mm Exit Pupil: 5 mm Field of View Linear: 298 ft at 1000 yds Field of View Angle: 5.3 degrees Optical Coating: Multi-Coated Binoculars Focus System: Center Focus Twilight Factor: 27 Interpupillary Distance: 72 mm Close Focus: 40 ft Diopter Adjustment Range: -4 - 8 dpt Weather Resistance: Yes Water Resistance Level: Water Resistant Length: 8.25 in Weight: 39 oz Package Type: Box Included Accessories: Objective Lens Cap Objective lens cap Rainguard Carrying case Neck strap Lens cloth Instruction manual Lens Cloth Rainguard Instruction Manual Neck Strap Carrying Case Magnification Type: Fixed Width: 8 in Tripod Adaptable: Yes Fogproof: No Nitrogen Filled: No Brightness Index: 25 Case: Yes Height: 2.8 in Armoring: Rubber Armored Features of Celestron 12 x 60 mm SkyMaster Porro Prism Binocular 71007: Water Resistant Multi-Coated Optics High quality BAK-4 Prisms Large Aperture - perfect for low light conditions and stargazing Long Eye Relief - ideal for eyeglass wearers Diopter Adjustment - for fine focusing Included Tripod Adapter No-Fault Lifetime Warranty Package Contents: Celestron 12x60 SkyMaster Porro Prism Large Aperture Binoculars 71007 Tripod Adapter Caps Case Strap