Canon EOS 7D Instruction Manual page 118

3 Setting the FlashN
Setting the External Speedlite Custom Functions
118
Display the Custom Function.
1
Select [External flash C.Fn setting],
then press <0>.
Set the Custom Function.
2
Turn the <5> dial to select the
function number, then set the
function. The procedure is the same
as setting the camera's Custom
Functions (p.204).
To clear all the Custom Function
settings, select [Clear ext. flash C.Fn
set.] in step 1.