Canon EOS R5 Advanced User's Manual page 241

3.
Set [Number of shots].
Specify the number of images captured per shot.
Can be set in a range of [2]–[999].
4.
Set [Focus increment].
Specify how much to shift the focus. This amount is automatically
adjusted to suit the aperture value at the time of shooting.
Larger aperture values increase the focus shift and make focus
bracketing cover a wider range under the same focus increment and
number of shots.
After completing the settings, press < >.
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