I have a Canon T2i in my Ikelite housing. In order to obtain focus and then lock it, I really had to stretch my hand around the handle. Sometimes I prematurely triggered the shutter while straining to make contact with the AE lock. So I have added an extension to the AE lock control knob, which has given me (with my small hands) better control.
It was a cheap and simple fix, and it didn't require duct tape. (I'm not saying duct tape is a bad thing, but I already have enough of that stuff on my rig). I have included a flicker link to show the fix:
John McCracken
