Canon EOS-1D X Mark III Af Setting Manualbook page 31

This setting allows obstacles that pass
in front of the subject to be ignored, as
well as focusing on new subjects.
With the AF Configuration Tool on the EOS-1D X Mark III,
not only can you select from [Case 1] - [Case 4], but
parameters for each can be adjusted individually. [Tracking
sensitivity] is the parameter that can be set to track a subject
that the AF point had been following until a different
subject (or background) got in the way.
The [Locked on: -2/-1] setting excludes subjects that come
into the AF point such as obstacles, and continues to focus
on the original subject. Selecting -2 results in the targeted
subject being tracked for a longer time before focus
changes to the subject now in the AF point.
The [Responsive: +1/+2] setting determines that subjects
that come into the AF point are new subjects to be focused,
and quickly focuses. It is also effective when you want to
quickly focus on subjects that are hidden and appear
suddenly.
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