3Custom 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, flash exposure compensation, etc. Effective when you prefer to control the exposure in less fine increments than 1/3-stop increments.
The exposure level will be displayed in the viewfinder and on the LCD panel as shown below.
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
Enables “L” (equivalent to ISO 50), “H1” (equivalent to ISO 12800), and “H2” (equivalent to ISO 25600) to be selectable for the ISO speed.
C.Fn I -4 Bracketing auto cancel
0:On
The AEB and WB-BKT settings will be canceled if you set the power switch to <2> or clear the camera settings. AEB will also be canceled when the flash is ready to fire.
1:Off
The AEB and WB-BKT settings will be retained even when the power switch is set to <2>. (When the flash is ready, AEB will be canceled. However, the AEB amount will be retained in memory.)