Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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 Selecting AI Servo AF CharacteristicsN
132
 
Tracking sensitivity
Sets the subject-tracking sensitivity 
during AI Servo AF when an obstacle 
cuts across the AF points or when the 
subject strays from the AF point.
0
Default setting. Suitable for moving subjects in general.
Locked on: -2 / Locked on: -1
The camera will try to continue focusing on the subject even if an 
obstacle cuts across the AF points or if the subject strays from the AF 
points. The -2 setting makes the camera keep tracking the target 
subject longer than the -1 setting.
However, if the camera focuses on a wrong subject, it may take 
slightly longer to switch and focus on the target subject.
Responsive: +2 / Responsive: +1
The camera can focus consecutively on subjects at different 
distances that are covered by the AF points. Also effective when you 
want to always focus on the closest subject. The +2 setting is more 
responsive than the +1 setting when focusing on the next subject.
However, the camera will be more prone to focus on an unintended 
subject.
Parameters
[Tracking sensitivity] is the feature named [AI Servo tracking sensitivity
in the EOS-1D Mark III/IV, EOS-1Ds Mark III, and EOS 7D.