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Back button AF problem

Hi guys,

I switch to back-button AF but have a very annoying problem. Whenever i move my AF point then press the back-button AF, the AF point jumps to the centre, focuses, then moves back the starting point, missing my chosen focus... I can't see how to turn this off? Any help?

I know I have read about this on the forum before, but i failed to find it, so sorry for the repetition!
 
You registered the center AF point. To cancel it, hold down the AF point selection button, then press the ISO/FEC button.

Note that if you have the option for separate orientation-linked AF point selection, you can register an AF point in each camera orientation.
 
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neuroanatomist said:
You registered the center AF point. To cancel it, hold down the AF point selection button, then press the ISO/FEC button.

It did not solve the problem!

I have held down the AF point selection button and while held down pressed and held the ISO/FEC button
I have pressed the AF point selection button then pressed and held the ISO/FEC
I have pressed the AF point selection button then pressed the ISO/FEC

Non of these have worked! Am i doing something wrong?
 
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