Custom Functions
The Speedlite 550EX has Custom Functions which enable you to customize Speedlite functions according to your preferences.
●Setting a Custom Function
1 Press the LCD panel illumination button for at least 2 sec. until 
appears on the LCD panel.
2 Press the < 
> button until the Custom Function No. to be altered blinks.
• Pressing the < 
> button selects the Custom Function No. from F1 to F6.
3 Press the < 
> or < > button to set the Custom Function setting to 0 or 1 according to your preference.
4 Press the < 
> button.
• The display stops blinking.
5 Press the LCD panel illumination
button or the < > button to return to the normal state.
• You need not press the LCD panel illumination button for 2 sec. or longer.
•A Custom Function can be set while the wireless selector is set to 
or 
.
•When a Custom Function has been set, the 
icon is displayed on the LCD panel.
