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 celestrons propri