Canon SPEEDLITE EL-1 Advanced User's Manual page 179

Multiple Flash Photography with Wireless Functions
Since the following functions set on the sender unit will be set automatically to the receiver
units on this wireless system, you do not need to operate the receiver unit(s). For this
reason, you can perform wireless flash photography in the same way as normal flash
photography.
Flash Exposure Compensation
FEB < >
FE Lock
High-Speed Sync
Manual Flash
• Wireless Multiple Flash Shooting with a set Flash Ratio
Stroboscopic Flash
Caution
The flash frequency when performing stroboscopic flash during optical transmission
wireless shooting can be set from 1 Hz to 199 Hz (settings from 250 Hz to 500 Hz
are not available).
Note
You can also directly operate the receiver unit to individually set the flash exposure
compensation and flash coverage on each receiver unit.
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