Canon EOS 40D - Custom Function Settings; C.fn I: Exposure; Increments

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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: Auto focus/Drive, C.Fn
IV: Operation/Others.
3 Custom Function SettingsN
C.Fn I: Exposure
C.Fn I -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, etc. Effective when you prefer to control the
exposure in less fine increments than 1/3-stop increments.
C.Fn I -2 ISO speed setting increments
0: 1/3-stop
1: 1-stop
C.Fn I -3 ISO expansion
0: Off
1: On
For the ISO speed, “H” (equivalent to ISO 3200) will be selectable.
The exposure level will be displayed in the viewfinder and on the LCD
panel as shown below.