Canon EOS-1D X Mark III Advanced User's Manual page 334

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AF Point Expansion (Manual Selection

Focuses using your manually selected AF point <

> and surrounding AF points. Effective

for moving subjects, which are difficult to track with 1-point AF.

Although with AI Servo AF, the camera must be able to focus on your initially selected AF

>, this mode makes it easier to focus on targeted subjects than with Zone AF.

With One-Shot AF, after the camera focuses with expanded AF points, those AF points

> are displayed with your manually selected AF point <

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