Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 115)

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Setting the Aperture Value Before Shooting (Aperture-Priority AE)
o If the “ 30" ” shutter speed blinks, it indicates
underexposure.
Use the <
6
> dial to decrease the f/number (open the
aperture) until the shutter speed stops blinking, or set a
higher ISO speed.
o If the “ 8000 ” shutter speed blinks, it indicates
overexposure.
Use the <
6
> dial to increase the f/number (close the
aperture) until the shutter speed stops blinking, or set a
lower ISO speed.
Aperture Value Display
o The higher the f/number, the smaller the aperture opening will be. The f/
number displayed varies depending on the lens. If no lens is attached to the
camera, “ 00 ” will be displayed for the aperture.