I am using my 20D for underwater photography and wish to uncouple focusing and exposure by setting CF 4 to 1, which uses the FEL button to achieve and lock focus. How can I then use FEL? Is there some way to change buttons for CF 4 or for FEL. When I use manual exposure settings this isn't a problem, but when I use auto expose, it is.
Appreciate any solutions.
Ed Druy
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