Custom Function Settings; C.fn I: Exposure; Exposure Level Increments; Iso Speed Setting Increments - Canon EOS 50D Instruction Manual

Custom Function SettingsN
3

C.Fn I: Exposure

C.Fn I -1
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.
The exposure level will be displayed in the viewfinder and on the LCD
panel as shown below.
C.Fn I -2
0: 1/3-stop
1: 1-stop
C.Fn I -3
0: Off
1: On
"H1" (equivalent to ISO 6400) and "H2" (equivalent to ISO 12800) will be
selectable for the ISO speed.
C.Fn I -4
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.)
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Exposure level increments

ISO speed setting increments

ISO expansion

Bracketing auto cancel