The Barska Cosmos 20x80 binoculars have been designed for astronomical viewing and long distance observation, especially in low light conditions thanks to the extra large 80mm objective lenses. Featuring standard BaK-4 Porro prisms with multi-coated glass, the 80mm lenses maximize light transmission and image clarity for immersing yourself in the vast night sky while the heavy duty, reinforced construction of the 20x80 Cosmos binocular has an integrated tripod mounting post for quick accessibility during long observations. The 20x80 Cosmos binoculars uses an individual eyepiece focus system for fixed distance viewing so you can lock in meteor showers and other astronomical events with ease.