Appendix 3. Custom Functions
Custom Functions (C.Fn.) are special options that you can program into your Speedlite. Custom functions reside in the circuitry of your gear. So they will not be wiped out when you change batteries.
The sequence of custom functions has changed with each new model of Speedlite. Fortunately, when the 430EX II was introduced, the custom functions used the same numbers as those on the 580EX II.
Setting Custom Functions
If you have a 580EX II or a 430EX II and a compatible camera body that displays the Speedlite’s menu on the camera’s LCD monitor, then this is the way to change the custom functions. The custom functions will be listed in plain English (or the language of your choosing) with the options listed in detail. ...
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