Celestron skymaster binocular 20x80 features high quality bak 4 prisms and multi coated optics for enhanced contrast the celestron skymaster model has been designed and engineered to meet the special demands of extended astronomical or terrestrial viewing sessions carrying case included and integrated tripod adapter rod for ultra stable tripod mounting each pair of celestron skymaster binoculars feature high quality bak 4 prisms and multi coated optics for enhanced contrast clear sharp