Thanks, Scott and David.
I'm drawn to the Ikelite housing as I'm currently using Ikelite strobes with a Canon 40d and Tokina 10-17 fisheye in an Ikelite housing. I think I'd find it hard to go back to having to wait for an internal flash to recycle.
The main reason that I'm considering going back to a compact camera, aside from the bulk of the DSLR, is that I miss the zoom range that I used to have with my old Canon A570 and Inon fisheye UFL-165. That silly little camera has a lot going for it, not the least of which was that I could use the entire 35-140mm zoom range and come in pretty tight even with the fisheye wet lens on. And, as my prime area of interest has always been wrecks and other CFWA, I never took the wet lens off.
Any thoughts on fisheye wet lenses for the the Ikelite G5X that would work without vignetting and still let me get the whole zoom range?
Jim