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

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: Shutter-Priority AE
 
If the maximum aperture blinks, it indicates 
underexposure. 
Turn the <6> dial to set a slower shutter speed until 
the aperture stops blinking or set a higher ISO speed.
 
If the minimum aperture blinks, it indicates 
overexposure. 
Turn the <6> dial to set a faster shutter speed until 
the aperture stops blinking or set a lower ISO speed.
Shutter Speed Display
The shutter speeds from “8000” to “4” indicate the denominator of the 
fractional shutter speed. For example, “125” indicates 1/125 sec. Also, “0"5” 
indicates 0.5 sec. and “15"” is 15 sec.