This has always been one of my pet peeves. I can't count the number of times I've witnessed people with poor buoyancy control damage the reef to take a picture -- or swim into me while I'm hovering. On the other hand, I've also witnessed some of the most amazing buoyancy control/underwater contortions and protection of the reefs by some experienced underwater photographers. I've always thought marine parks should require underwater photographers to pass some sort of park specific buoyancy test before they could use cameras at a park -- something I'm sure will never happen. Nothing ruins a dive more than seeing someone trash a beautiful reef. Unfortunately, with the relative cheapness and availability of digital underwater cameras, it seems to be more and more prevalent on my trips.