Custom Function Settings; C.fn I: Exposure - Canon EOS Rebel T5i Instruction Manual

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Custom Function SettingsN
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 in the viewfinder and on
the LCD monitor as shown below.
C.Fn-2
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.
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Exposure level increments
ISO expansion