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Custom Functions are organized into four groups based on the function type:
C.Fn I: Exposure, C.Fn II: Image, C.Fn III: Autofocus, C.Fn IV: Operation/
Others.
3 Custom Function Settingst
C.Fn I: Exposure
C.Fn-1 Exposure level increments
0: 1/3-stop
1: 1/2-stop
Sets 1/2-stop increments for the shutter speed, aperture, exposure
compensation, AEB, flash exposure compensation, etc. This is effective
when you prefer to control the exposure in less fine increments than 1/3-
stop increments.
C.Fn-2 ISO expansion
0: Off
1: On
When you set the ISO speed, you will be able to set “H” (equivalent to ISO
25600) for still photos and “H” (equivalent to ISO 12800) for movies. Note
that if [C.Fn-3: Highlight tone priority] is set to [1: Enable], “H” cannot
be set.