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My 7D mark 2 allows me to perform exposure compensation when shooting in manual mode with auto-ISO.  Apparently my 5D mark 3 does not allow this option.  I have the 1.3.6 firmware installed, but this didn't seem to solve the problem.  Is there a fix ...

I own both a 7D2 and a 5D3.  I use back button focus on both cameras.  When I change the focus point on the 7D2, I have no problem using back button focus.  However, after moving the focus point on the 5D3, pushing the back button used to focus cause...