The Fuji FinePix F810 is an above water camera, with an optional Underwater casing made by Fuji, and there is also another casing made by Ikelite. The Ikelite housing that is rated to a depth of 200 feet (60 metres).

This camera features a shutter lag time of only 0.025 seconds, so is also well suited for underwater use.
It also has a widescreen setting and a very high image quality.
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Fuji F810 Scuba Diving Camera