Canon EOS-1D X Mark III Af Setting Manualbook page 23

Case 3
Focus instantly on subjects that
move into the AF points.
[Case 3] is the ideal setting for
situations when you want to
focus quickly on subjects in the
AF points.
Parameter default settings
Subject tracking sensitivity
Accelerate / decelerate Tracking
In [Case 3], the [Tracking sensitivity] parameter is set to
[Responsive: +1]. As a result, subjects that come into the
AF points will be focused on more quickly. This setting is
most effective when subjects appear suddenly in the frame
(for example photographing skiers in an alpine skiing
downhill race).
When shooting continuous shots using the AI Servo AF or
Servo AF, this setting can be very effective when switching
between different subjects you want to shoot (for example,
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[Responsive: +1]
［+1］