Canon SPEEDLITE EL-1 Advanced User's Manual page 148

Setting the flash output and flash exposure compensation amount
Push the joystick up / down / left / right or turn <
and push the joystick vertically.
Push the joystick to the left or right or turn <
or flash exposure compensation amount, then push the joystick
vertically.
When using the <
<
amount as required.
Repeat step 3 to set the firing function for all firing groups.
5.
Check the charge status and then shoot.
When <
are not fully charged by the indication on the screen on the left. For
example, when firing group <
When all firing groups are fully charged, <
See Step 7 in
other charge confirmations.
Each receiver unit fires simultaneously in the respective flash mode
set.
> mode, set the flash output. When using
> < > mode, set the flash exposure compensation
> is displayed, you can check the firing groups that
"Automatic Flash Photography with 1 Flash
148
> to select an item,
> to set the flash output
> is fully charged, (1) is displayed.
> disappears.
Receiver" for