Canon EOS 30D Instruction Manual

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3
 Custom Function SettingsN
170
C.Fn-06
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.
C.Fn-07
Flash firing
You can enable the built-in flash, external Speedlite, and non-Canon 
flash connected to the PC terminal to fire.
0: Fires
1: Does not fire
This will disable the flash, but the AF-assist beam will still be 
emitted. Note that whether or not the AF-assist beam is emitted is 
dependent on the C.Fn-05 setting.
C.Fn-08
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.