After resisting the urge for many years I finally made the plunge and started taking underwater photography. I purchased the SD 800 IS and the Cannon housing. I picked up a Sea and Sea strobe for a pretty good price from B & H Photo in NY.
Then I headed to Cozumel for 4 days of diving and shooting. In short, the camera is beautiful. I did not require any weights for the case. It is just slightly negatively bouyant and I had a blast with it.
I tried everything. The Underwater setting worked great for setting the balance while using the strobe. Without a strobe I do not think it would make any difference. I even tried capturing short video clips while moving through a cave or watching an Spotted Eagle Ray digging into the white sand.
If you would like to see some of the shots I have taken with the camera, you can go to my home website. web.mac.com/robnbill. There are shots taken in January in Cozumel and then from a number of islands during a Western Caribbean Cruise in February/March.
One thing I am going to try the next dive sets is to zoom the camera slightly so I can get farther from the subjects. The adage I had been told was you could not get close enough. However, what I found was if I was physically very close, the strobe did not have enough time to spread out resulting in seeing the straight edges of the square strobe. Slightly farther back and I did not get the same thing.
All told, I love the camera setup. When I am on shore, I pull the camera out, stick it in my pocket and get great shots on land. After trying this the first time in Cozumel, I bought a second one so I will have a back up should one fail.
Try the website. Enjoy
Bill