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. 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. Celestron's SkyMaster Series of large aperture binoculars are a phenomenal value for high . Celestron has designed and engineered the larger SkyMaster models to meet the special dema . 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 lightweig .