Ideal for amateur astronomers, the SkyMaster Pro binoculars from Celestron have large 70mm objective lenses that are ideal for low light conditions or astronomical observation. They are both waterproof and nitrogen-purged, making them suitable for use in all and any weather conditions, and are rubber-armoured to protect from knocks and scratches. Built into the binoculars are a tripod adapter and RSR rail for attaching a red dot finderscope. With each surface multi-coated with Celestron's proprietary XLT coating technology, and BaK-4 prisms within the binoculars, the Celestron SkyMaster Pro 15x70 Binoculars will produce crisp, high contrast images with outstanding resolution.