Canon EOS cameras have a user-selectable option (called custom functions or CF) that allows you to change the auto-focus operation to another button on the camera than the shutter release button. Basically instead of pressing the shutter release halfway and then have the camera focus you can press the other button for focussing and then just shoot the picture with the release. This is useful in situations where for example the distance to the subject doesn’t change.

I have struggled with CF4 lately, since trying my luck on the streets. I have had CF4 set ever since I got my 5. It’s brilliant, but in the last few weeks I was rethinking and trying out some combinations to find a new setup, because it was holding me up.
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