Underwater photographers have several basic options for equipment.

There exists several usable alternatives for underwater photography, like digital point and shoot cameras, compact digital cameras with full exposure controls, and SLRs (single lens reflex cameras). Unlike the earlier amphibious or waterproof camera, the first was the Calypso, reintroduced as the Nikonos in 1963, which is designed specifically for use underwater, these cameras now require a housing for underwater use. Nikon d...