Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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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.
3
 Custom Function SettingsN
C.Fn1: Exposure
Exposure level increments
C.Fn1
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.
ISO speed setting increments
C.Fn1
1/3: 1/3-stop
1/1: 1-stop
You can change the manual ISO speed setting increments to a 
whole-stop.
When [1/2-stop] is set, the exposure level will be displayed as shown 
below.
 
Even if [1-stop] is set, ISO speed will be automatically set in 1/3-stop 
increments when ISO Auto is set.
 
Even when [1-stop] is set, you can set ISO 32000.