Canon EOS Rebel SL1 18-55mm IS STM Lens Kit - Manual (Page 300)

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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