Custom Function Setting Items; C.fn I: Exposure - Canon EOS REBEL T7i Instruction Manual

Custom Function Setting ItemsN
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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/Drive,
C.Fn IV: Operation/Others.

C.Fn I: Exposure

C.Fn-1
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.
With setting 1, the exposure level will be displayed as shown below.
C.Fn-2
0: Off
1: On
When you set the ISO speed, you can set "H" (equivalent to ISO
51200) for still photos and "H" (equivalent to ISO 25600) for
movies. Note that if [C.Fn-4: Highlight tone priority] is set to
[1:Enable], "H" cannot be selected.
C.Fn-3
0: Enable
When you set the power switch to <2>, the exposure
compensation setting will be canceled.
1: Disable
The exposure compensation setting will remain in effect even if
you set the power switch to <2>.
390
Exposure level increments
ISO expansion
Exposure compensation auto cancel