Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 320)

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Movie Servo AF Speed
You can set the Movie Servo AF’s AF speed and its operation conditions.
The function is enabled when using a lens supporting slow focus transition
during movie recording*.
1 Select [ z : Movie Servo AF speed].
 When active:
You can set [Always on] to have the AF
speed take eff ect at all times for movie
recording (before and during movie
recording) or set [During shooting] to
have the AF speed take eff ect only during
movie recording.
 AF speed:
You can adjust the AF speed (focus
transition speed) from the standard speed
(0) to slow (one of seven levels) or fast
(one of two levels) to obtain the desired
eff ect for the movie creation.
* Lenses supporting slow focus transition during movie
recording
USM and STM lenses released in and after 2009 are compatible. For
details, refer to the Canon website.