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On Canon's there are multiple focus points in the viewfinder, and if you leave it up to the camera to choose, you need to be very aware of the point that it has chosen to focus on. Their autofocus is very very good, but often on auto it is easy to overlook where it has decided to focus on. In practice, I always force the camera to focus on the centre square. Press the shutter release halfway with the central square where you want to focus (it helps to have a vertical edge on the subject) then reframe the shot with the shutter release still held halfway in. Then fire!
I almost never focus manually - unless there is a good reason - like low light/low contrast subject.
Adam
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