Canon EOS 5D Mark III Instruction Manual (en)

Under the [8] tab, you can customize 
various camera features to suit your 
picture-taking preferences. Any settings 
different from the default will be 
displayed in blue.
 Custom Function SettingsN
C.Fn1: Exposure
Exposure level increments
1/3: 1/3-stop
1/2: 1/2-stop
Sets 1/2-stop increments for the shutter speed, aperture, exposure 
compensation, AEB, flash exposure compensation, etc. Effective when 
you prefer to control the exposure in less fine increments than 1/3-stop 
ISO speed setting increments
1/3: 1/3-stop
1/1: 1-stop
Bracketing auto cancel
ON: Enable
When you set the power switch to <2>, the AEB and white balance 
bracketing settings will be canceled. AEB will also be canceled when the 
flash is ready to fire or if you switch to movie shooting.
OFF: Disable
The AEB and white balance bracketing settings will not be canceled 
even if you set the power switch to <2>. (If the flash is ready to fire or 
if you switch to movie shooting, AEB will be canceled temporarily, but 
the AEB range will be retained.)
With [1/2-stop] set, the exposure level will be displayed in the viewfinder 
and on the LCD panel as shown below.