Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 423)

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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 Settings
C.Fn1: Exposure
Exposure level increments
C.Fn1
1/3: 1/3-stop, Exposure compensation 1/3-stop
Sets 1/3-stop increments for the shutter speed, aperture, exposure
compensation, AEB level, and flash exposure compensation.
1/1: 1-stop, Exposure compensation 1/3-stop
Sets whole-stop increments for the shutter speed and aperture,
and 1/3-stop increments for exposure compensation, AEB level,
and flash exposure compensation.
1/2: 1/2-stop, Exposure compensation 1/2-stop
Sets 1/2-stop increments for the shutter speed, aperture, exposure
compensation, AEB level, and flash exposure compensation.
ISO speed setting increments
C.Fn1
1/3: 1/3-stop
You can set the ISO speed manually in 1/3-stop increments.
1/1: 1-stop
You can set the ISO speed manually in 1-stop increments.
When [ 1/2-stop, Exposure compensation 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.