Don't?
To me - unless you are a good above water photog - you wont be a good under water photographer. Plus unless you are going to spend a LOT of money, you will have a hard time getting good pics. Plus.....unless you are experienced at shooting in current (as I assume this relates to taking said camera to Cozumel?), you will have a hell of a time shooting anything as you go by in the current. Trying to stop to set up pics causes you to grab stuff, slow down the group, seperate the group, split the group, and generally piss off the rest of the group.
Novice photographer + low end camera + current = bad pics and irritating the rest of the group IMHO.
I say this, as on my July trip to cozumel, I had said n00b photographer (x2!) on most of my dives. On the 2nd or 3rd day, they busted out a pelican case and said "hey lets try our cameras!" and went about assembling a pair of decently sub par set ups, with not enough flash, and NO clue as to how to use said cameras above, or below ground. Suffice it to say: they constantly stopped (or tried to) in the current, grabbed stuff, slowed us down, stretched us out, got seperated etc etc etc. Add ot it, 95+% of their pics were horrid.....yet they kept at it day after day. By my last day I was tempted to find a dive knife and cut the camera tethers and send them to davey jones camera locker!!!!
I have dove with good experienced photogs, and the difference is night and day, especially the guys who are good in current - but if you are new to it, Cozumel is not the best place to learn. Plus for the money you would spend on GOOD gear, you would be much better off buying a GoPro vid camera, mount a decent LED light to it with a home made handle system = WIN for making memories of your dives. Much easier to accomplish and get GREAT results.
/end soap box on my biggest Coz pet peeve!
