Product DescriptionCelestron has designed and engineered the larger SkyMaster models to meet the unique demands of extended astronomical or terrestrial viewing sessions. Our extra-large & powerful binoculars ensure high performance in all weather conditions. The SkyMaster is ideal for astronomical viewing or terrestrial (land-based) viewing over long distances. Due to its size and weight-including its very large objective lenses-this binocular should be mounted on a standard photographic tripod for extended periods of use. We’ve included a tripod adapter rod that allows you to mount your SkyMaster binoculars on any sturdy ¼”-20 photographic tripod in seconds. Astronomers have praised the Celestron SkyMaster for decades for its high-quality BaK-4 prisms and multi-coated optics, which enhance contrast and bring out bright, sharp images-especially in low-light conditions. The binoculars feature soft, comfortable rubber eyecups that block stray light. Eyeglass wearers can fold down the eyecups and view with their eyeglasses on. Your purchase of the Celestron SkyMaster 15x70 binoculars includes the tripod adapter, objective lens caps, a rainguard, a deluxe carrying case, a neck strap, a lens cloth, and an instruction manual. Buy with confidence from the world’s No.1 telescope brand and a leading binocular manufacturer, based in California since 1960.Amazon.comBinoculars come in a wide range of shapes and sizes these days, and an even wider range of prices. It's easy to spend less than $100 or more than $500 for what may appear to be, at least outwardly, comparable models. While they may look the same, they are probably quite different on the inside.