Canon Speedlite Transmitter ST-E3-RT - Manual (Page 56)

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You can customize the transmitter features to suit your shooting
preferences with Custom Functions and Personal Functions. Note that
the Personal Functions are customizable functions unique to the
transmitter.
1
Display the Custom Functions screen.
Press function button 1 <=>
continuously until the screen is
displayed.
X The Custom Functions screen is displayed.
2
Select an item to set.
Turn < 9 > to select an item
(number) to set.
3
Change the setting.
Press the < 8 > button.
X The setting is displayed.
Turn < 9 > to select the setting that
you want, and press the < 8 > button.
Press function button 4 <?> to
return to the shooting-ready state.
1
Display the Personal Functions screen.
After performing step 1 in the Custom
Functions procedure, press function
button 1 <<>.
X The Personal Functions screen is
displayed.
2
Set the function.
Set the Personal Function in the
same way as steps 2 and 3 for the
Custom Function.
C / >: Setting Custom and Personal Functions
C: Custom Functions
>: Personal Functions
COP
Y