Canon EOS R5 Advanced User's Manual page 110

3.
Check the display.
As long as the exposure value is not blinking, standard exposure will be
obtained.
4.
Take the picture.
Compose the shot and press the shutter button completely.
Caution
If the "30"" shutter speed and the lowest aperture value blink, it indicates
underexposure.
Increase the ISO speed or use flash.
If the "1/8000" shutter speed and the highest aperture value blink, it indicates
overexposure.
Lower the ISO speed or use an ND filter (sold separately) to reduce the amount of
light entering the lens.
110