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. The 15x70 version is one of the most popular models in the series. It offers serious large aperture light gathering in an affordable and reasonably lightweight configuration. Protective rubber covering for ultra-firm grip Large center focus know for easy focusing Tripod adapter included Long eye relief ideal for eyeglass wearers Carrying case included for travel and safe storage Celestron No Fault Warranty provides best protection and product support on the market Optical Design - Porro Diameter - 70 mm (2.76 in) Magnification - 15x Angular Field Of View - 4.4 degrees Linear Field Of View at 1000 YDS - 230.41 ft (70.23 m) Exit Pupil - 4.7 mm (0.19 in) Eye Relief - 18 mm (0.71 in) Near Focus (Binoculars) - 43 ft (13.11 m) Prisms - BAK-4 Optical Coatings - Multi-Coated Carrying Case - Nylon / Strap - Yes / Caps - Yes Water Resistant Tripod Adaptable - Yes Weight 48 oz (1360.78 g)