Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 319)

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Movie Servo AF Track Sensitivity
You can adjust the tracking sensitivity (to one of seven levels), which aff ects
responsiveness if the subject strays from the AF point during Movie Servo
AF, as when interfering objects move across AF points or when you pan.
1 Select [ z : Movie Servo AF track
sens.].
 Locked on: –3/–2/–1
With this setting, the camera is less
likely to track a diff erent subject if the
main subject strays from the AF point.
The closer the setting is to the minus (–)
symbol, the less the camera is inclined
to track a diff erent subject. It is eff ective
when you want to prevent the AF points
from rapidly tracking something that is
not the intended subject during panning
or when an obstacle cuts across the AF
points.
 Responsive: +1/+2/+3
This makes the camera more responsive when tracking a subject that
covers the AF point. The closer the setting is to the plus (+) symbol,
the more responsive the camera is. It is eff ective when you want
to keep tracking a moving subject as its distance from the camera
changes or to rapidly focus on another subject.
o Available when [ z : Movie Servo AF] is set to [Enable] and [ z : AF
method] is set to [1-point AF] .
o Operation when [ z : AF method] is set to an option other than [1-point AF]
is equivalent to a setting of [0] .