Ideal for amateur astronomers the skymaster pro binoculars from celestron have large 80mm objective lenses that are ideal for observation at dusk dawn and night time 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 proprietary x