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this is the exact housing I used...or more like a pvc bag
I used an sb900, set the camera to aperture, set the aperture to 5.6, iso 400.
Once in the water, forget about changing anything as the housing makes it very difficult. The zoom ring is about the only thing that can be accessed and moved without much difficulty.
I pretty much kept it at 16mm and worked out great.
Tips I got from a buddy that's an underwater photog.
Load the camera into the bag in an airconditioned room.
Add packs of silica inside the housing with the camera (keeps the port from getting condensation)
Once the camera is inside and sealed, keep it out of direct sun, I keep a light colored towel over it. (helps to keep it cool and avoid condensation)
I use anti fog on the inside of the lens port and has worked out great.
That's pretty much it.