Canon EOS 3 User Manual (en)

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Flash Photography with Speedlite 550EX
Wireless Multi-Flash System
The Canon Speedlite 550EX has the following three features:
(1) E-TTL autoflash
(2) Slave unit
(3) Wireless master control of other slave-triggered 550EX units
By using the above features, you can set up a wireless E-TTL autoflash
system with up to three Speedlites. You can also set the flash output ratio
between the Speedlites to create the desired flash lighting effect.
• For details, see the 550EX and ST-E2's Instructions.
Wireless multi-flash system
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Canon 
Speedlite 
Transmitter 
ST-E2
Canon Speedlite
550EX
Canon Speedlite
550EX
 07. C836-E (91~)   28-01-2003  12:41  Pagina 99