Comments about Ewa-Marine Ewa-Marine Underwater Housing for Canon Digital SLR Cameras, Fits EOS Digital Rebel XTi, XSi, EOS-40D, EOS-400D, EOS-450D, (Rated for 150'):

Great product. I used this with my Canon digital rebel XT and an 18-55mm lens. I used this case while snorkeling in Kauai and it didn't leak when I dove to depths of 20 ft. If you take care when loading your camera and prepping the case, you shouldn't have water leakage problems.

My only complaints are that 1) the trigger finger slot is awkward to use with my camera. The plastic is thick so I couldn't feel when the shutter trigger was half depressed. Instead, I pressed the shutter trigger through the plastic wall of the case with better results. 2) The provided foam pads don't fit the digital rebel XT well. For my next dives I'll buy some foam and cut it to exact size. The result of the poor fits are that sometimes the front lens ring appears in the photos.

Some notes: Always use a flash underwater. I am an amateur underwater photographer and I found that using a smaller focal length was better. It forces you to get closer to your subject, but this will minimize the detrimental effects of floating particles and generally unclear water. You get better pictures if you take them at the same depth as your subject so dive down to the fish. They look better from the side than above anyhow. I would also recommend using dive weights for yourself and your camera. I had to half exhale to stabilize myself and the camera but this minimized the time I could spend with my subjects.