Canon EOS R10 User Manual page 345

2.
Select [ : Shooting mode].
3.
Select [Movie auto exposure].
4.
Focus on the subject.
Before recording a movie, focus with AF (
By default, [
camera always keeps focusing (
When you press the shutter button halfway, the camera focuses using
your specified AF area.
: Movie Servo AF] is set to [Enable] so that the
).
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) or manual focus ( ).