Canon EOS-1D X Mark III Af Setting Manualbook page 21

Case 2
Continue to focus-track even
when the subject momentarily
moves from the AF points.
[Case 2] is an effective setting for
shooting fast moving subjects
when they move away from the
selected AF point, or when
obstacles may momentarily
obscure the subject.
Parameter default settings
Tracking sensitivity
Accel./decel. tracking
[Case 2] is an effective setting for shooting fast moving
subjects when they move away from the selected AF point,
or when obstacles may momentarily obscure the subject.
Sometimes when the subject moves from the selected AF
point, focus can shift to the background. By selecting [Case
2] in situations like these, the camera will attempt to
continue to focus-track the desired subject.
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