Canon EOS R5 Mark II Advanced User's Manual page 139

4.
Take the picture.
Caution
If a slow shutter speed and low aperture value blink, the subject is too dark.
Increase the ISO speed or use flash.
If a fast shutter speed and high aperture value blink, the subject is too bright.
Lower the ISO speed or use an ND filter (sold separately) to reduce the amount of
light entering the lens.
Note
Differences between [P] and [
[ ] mode limits available functions and sets the AF area, metering mode, and
many other functions automatically to prevent bad shots. In contrast, [P] mode only
sets the shutter speed and aperture value automatically, and you can freely set the
AF area, metering mode, and other functions.
Program shift
In [P] mode, you can freely change the combination (program) of shutter speed and
aperture value set automatically by the camera while maintaining the same
exposure. This is called Program shift.
With Program shift, you can press the shutter button halfway, then turn the <
dial until the desired shutter speed or aperture value is displayed.
Program shift will be canceled automatically when the metering timer ends
(exposure setting display turns off).
Program shift cannot be used with flash.
Compose the shot and press the shutter button completely.
] modes
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