Canon EOS 80D - Manual (Page 416)

3 Custom Function SettingsN
416
C.Fn II: Autofocus
C.Fn II -1 Tracking sensitivity
Sets the subject-tracking sensitivity during
AI Servo AF when an obstacle cuts across
the AF points or when the AF points stray
from the subject.
0: Default setting suited for most subjects. 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.
[Tracking sensitivity] is the feature named [AI Servo tracking sensitivity]
in the EOS-1D Mark III/IV, EOS-1Ds Mark III, and EOS 7D.