Aperture-Priority AE / Depth-of-field Preview
Exposure Warnings
• If the 30” shutter speed blinks, it indicates underexposure. Turn the
< 
> dial to set a larger aperture (lower f/number) until the shutter speed stops blinking.
• If the 8000 shutter speed blinks, it indicates overexposure. Turn the
< 
> dial to set a smaller aperture (higher f/number) until the shutter speed stops blinking.
• C.Fn-16 enables the safety shift feature. (→p.137)
If a correct exposure cannot be obtained in the aperture-priority AE mode with any shutter speed set by the camera, the camera automatically sets a larger or smaller aperture. This feature is called safety shift.
•C.Fn-06 enables the aperture to be set in full-stop or 1/2-stop increments instead of the standard 1/3-stop increments. (→p.134)
•For aperture-priority AE, C.Fn-05-2/3 enables the aperture to be set with the camera even while the lens is detached. (→p.134)
Depth-of-field Preview
The depth of field is the range of acceptable focus in front of and behind the point of focus. (→p.156) The depth of field changes depending on the aperture.
Press the depth-of-field preview button to stop down the aperture and see the range of acceptable focus in the viewfinder.
• Pressing the depth-of-field preview button also sets AE lock.
• The depth-of-field preview button does not function during AF operation.
