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The Roatan shots are very impressive. I was in Roatan about 5 years ago, and your shots are better than what I remember seeing. It definitely wasn't bad, but the number of fish was rather disappointing. I did most of my snorkeling off West Bay Beach and in Half Moon Bay. Where did you go? The highlights were the two day trips we took by boat to the Cayos Cochinos (Hog Islands) and to Utila. I'm tentatively thinking of going to Utila in 2013.
Thanks everyone for the comments. Before 2007, I used an older Canon S30 3 mgp camera. Since then, I have been using a Canon A630 8 mgp. Photos #1, 2, 5, 8, and 9 above were taken with the 3 mgp camera; the others were from the newer camera. Although I got some good photos with the S30, there was definitely an improvement in quality with the newer camera, especially in terms of cropping. I use the regular Canon housings, which are much cheaper and less bulky than other housings such as Ikelite. One other thing I consider essential for snorkeling photography is a weight belt. Otherwise, you can't get down with the fish. Snorkeling photos from the surface looking down almost never turn out very good.