"Another reason for my using two bodies, is that my underwater setup would be expensive to do over - my housing is for the 20D, and I do not want to re do it."

Hey Marty,

I had completely forgotten that you do a lot of under water work. I thought the 5d was significantly larger that it would require a different housing. I guess I am wrong. :P However, I thought that the housings were built intentionally with very little wiggle room.

James