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Cecil:One thing that that did shock me when I read the specifications [for the Olympus C-8080] is that it only focuses down to 0.8 meters (2.5'), ***. That is out of range of most stuff UW. I would guess a WA lens would fix that problem.
Actually, it focuses much closer, to 2 inches. The lens has three focus ranges: Standard, 0.8 m - Infinity (2.6 ft - Infinity), Macro, 20 - 80 cm (7.9 - 31.5 in), Super Macro, 5 - 20cm (2.0 - 8 in). You select the focus range via the menu. The close up ranges have fixed focal length, but allow you to get real close. People usually set up macro as a custom MyMode, so it is quick to set up. As on land, the close focus ranges have very narrow depth of field, so I set focus approximately and move the camera in and out for desired focus.
Be aware that because the 5:1 zoom lens moves in a lot for its widest focal length, the port for it must be pretty wide to avoid vignetting -- precluding the use of wet lenses due to the diameter of the port. You can put a closup lens on the lens inside the port, if you are sure you just want close focus this dive.
You can use the Ikelite dome port with Oly WCON 0.8D lens inside the housing for wider angle shots. You may also be able to use the INON WA lenses inside this port (I recall Ike once mentioning this, so give them a call to verify). If you use the Oly PT-023 housing, Athena makes a dome port for it that you use with the Raynox FE180PRO fisheye; very expensive, but superb.
Be aware that you cannot use the internal flash with the Ikelite housing, but you can with the Olympus housing. You probably want external flash anyway.