Canon EOS-1D X Mark III Af Setting Manualbook page 67

Subject tracking settings
Track and focus on the
athlete's head with
[AF priority (People):
Enable] and [Subject
switching: Enable
(slow)] in [Subject
tracking settings].
Using these settings it is possible
to continuously focus on the
subject's head and shoot with
auto selection of AF points by
detecting the athlete's face and
head.
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