Canon SPEEDLITE EL-1 Advanced User's Manual page 176

8.
Check the operation.
Press the sender unit's test flash button.
The Speedlite will fire. If it does not fire, check that it is placed within
the transmission range (
9.
Take the picture.
Set the camera and take the picture in the same way as with normal
flash shooting.
Caution
If there is a fluorescent light or computer monitor near a receiver unit, the presence
of the light source may cause the receiver unit to malfunction and fire inadvertently.
During optical transmission wireless shooting, even if the sender and receiver units
(firing group) are not all fully charged, <
sender unit's LCD panel as it is with radio transmission wireless shooting (with
sender flash firing OFF). Also, there is no function for illuminating or turning off the
sender unit's LCD panel according to the charge status of the sender unit and
receiver units.
When P.Fn-06-0 is set on the sender unit (
sender unit is fully charged (This beep does not indicate that charging of all flash
units is completed as it does with radio transmission wireless shooting).
).
> will not be displayed on the
), the beep will sound when the
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