Canon EOS-1D X Mark III Af Setting Manualbook page 49

1-point AF
[1-point AF] is an easy to use mode for
still life photos etc. in One-shot AF.
[1-point AF] is a mode where one
manually selected AF point is used to
focus.
Viewfinder shooting
[1-point AF (manual selection)]
For experienced photographers or when it is easy to track
the subject with a single AF point, AI Servo AF or Servo AF
can be utilized with continuously shooting moving subjects.
However, this mode is effective for shooting still life and
landscapes with One-shot AF mode.
Live View shooting
[1-point AF]
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