Canon EOS 5D MARK II Instruction Manual page 6

Tv: Shutter-Priorky AE
If the maximum aperture blinks, it indicates
underexposure.
Turn the <_> dial to seta slower shutter speed until
the aperture stops blinking or set a higher ISO speed.
If the minimum aperture blinks, it indicates
overexposure.
Turn the <_> dial to set a faster shutter speed until
the aperture stops blinking or set a lower lSO speed.
_] Shutter Speed Display
The shutter speeds from "8000" to "4" indicate the denominator of the
fractional shutter speed. For example. "128" indicates 1/125 sec. Also. "0"8"
indicates 0.5 sec. and "18"" is 15 sec.
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