UNDERWATER PHOTOGRAPHY: I'm going on a whale shark safari next week and I was hoping for some tips. I'll basically be swimming with 20 foot fish and doing my best to stay out of their way while I take pics of them. Mostly snorkeling with some dives up to 10 feet. Going to be using a T1i and probably the kit lens with a 430 EX II. Got a pouch to stick it in. Ikelites are too expensive.