Celestron's SkyMaster Series of large aperture binoculars are a phenomenal value for high performance binoculars ideal for astronomical viewing or for terrestrial (land) use - especially over long distances. Each SkyMaster model features high quality BaK-4 prisms and multi-coated optics for enhanced contrast. Celestron has designed and engineered the larger SkyMaster models to meet the special demands of extended astronomical or terrestrial viewing sessions.Features:- 15x magnification porro prism binocular- Large 70 mm objective lens offers maximum image brightness in low-light and long-range conditions- Ultra sharp focus across the field of view- Multi-Coated optics for sharp, clear views- Suitable for terrestrial or astronomical viewing- Protective rubber covering for ultra-firm grip- Large center focus knob for easy focusing- Tripod adapter included- Long eye relief ideal for eyeglass wearers- Carrying case included for travel and safe storageSpecifications:- Magnification: 15x- Objective Lens Diameter: 70mm (2.75´´)- Focal Length of Objective Lens: 279.63mm (11´´)- Angular Field of View: 4.4°- Linear Field of View (1000 yds) / 1000 m): 231 ft (77 m)- Exit Pupil: 4.7mm (.18´´)- Eye Relief: 18mm (.71´´)- Close Focus: 43 ft (13 m)- Interpupillary Distance (max): 72mm (2.83´´)- Interpupillary Distance (min): 56mm (2.20´´)- Diopter Adjustment Range: -4 to +8- Twilight Factor: 32.4- Relative Brightness: 22.09- Limiting Stellar Magnitude: Ideal: 11.73 Moderate: 10.73 Poor: 9.73- Lens Coatings: Multi-Coated- Prism Glass (Type): BaK-4- Weight: 48 oz (1361 g)- Environmental Protection: Water Resistant- Tripod Adaptable: Yes- Carrying Case: Nylon- Dimensions: 220mm x 110mm x 280mm (8.7´´ x 4.3´´ x 11.0´´)Included:- Tripod Adapter- Objective Lens Caps- Rainguard- Neck Strap- Lens Cloth- Instruction ManualSolar Warning:- Never look directly at the Sun with the naked eye or with this optic. Permanent and irreversible eye damage may result.- Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.- Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.