Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 87)

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Setting the AF and
Drive Modes
The AF points in the viewfinder
are arranged to make AF shooting
suitable for a wide variety of
subjects and scenes.
You can also select the AF operation and drive mode
that best match the shooting conditions and subject.
< AF > stands for autofocus. < MF > stands for manual focus.