Canon SPEEDLITE EL-1 Advanced User's Manual page 208

P.Fn-04:
Push the joystick vertically to display the setting screen as shown in the figure and turn
< > to select whether to allow the following functions to be set directly.
0: OFF (Disabled)
This is the normal operation method.
1: ON (Enabled)
You can select the items "flash exposure compensation amount", "manual flash output",
"firing group control", "flash ratio", "firing mode during group firing", "firing group of
receiver unit" and " FEB" with the joystick and set them directly simply by turning <
When the flash mode is set to <
"number of flashes" directly, and when it is set to <
speed" and "aperture value" directly.
Caution
To select an item in the settings screen when P.Fn-04-1 is set, push the joystick
up / down / left / right.
(Change settings with dial)
>, you can set the "flash frequency" and
208
>, you can set the "ISO
>.