Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 298)

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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.
3 Custom Function SettingsN
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.
With setting 1, the exposure level will be displayed in the viewfinder and on
the LCD monitor as shown below.
COP
Y