Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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d
: Program AE
 
If the “30"” shutter speed and the maximum aperture 
blink, it indicates underexposure. 
Increase the ISO speed or use flash.
 
If the “8000” shutter speed and the minimum aperture 
blink, it indicates overexposure. 
Lower the ISO speed or use an ND filter (sold 
separately) to reduce the amount of light entering the 
lens.
Differences Between <d> and <
A> Modes
In the <
A> mode, many functions such the AF mode and metering mode 
are set automatically to prevent spoiled shots. The functions you can set are 
limited. With <d> mode, only the shutter speed and aperture are set 
automatically. You can freely set the AF mode, metering mode, and other 
functions (p.346).
About Program Shift
 
In the Program AE mode, you can freely change the shutter speed and 
aperture combination (Program) set automatically by the camera while 
maintaining the same exposure. This is called Program shift.
 
To shift the program, press the shutter button down halfway, then turn the 
<6> dial until the desired shutter speed or aperture is displayed.
 
Program shift is canceled automatically after the picture is taken.
 
Program shift cannot be used with flash.