Canon EOS-1D X Mark III Af Setting Manualbook page 80

[Eye Detection AF]
Effect of head detection
disappears, or scenes from the back and the face is hidden
due to movement of the subject such as rotation, the face
detection and head detection is automatically switched and
tracking
continues, so it is
effective for
sports shooting.
Effective for portrait
shooting
The person's eyes are
detected, and focus is
performed automatically. Even
when the large-aperture lens
is at maximum aperture and
the depth of field
is shallow, this is
extremely
effective in cases
where you want
to focus on the
subject's eyes.
Effective for sports
shooting
When a person's head is
detected, the camera will
focus in that area. Even when
shooting scenes such as
where the face appears and
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