Canon 550EX - Manual (Page 51)

For Type-A Cameras
Wireless Flash Photography
This section covers wireless flash photography with the 550EX. It explains the
550EX’s built-in master and slave flash features,
550EX Wireless Flash Features
• A wireless flash system with multiple Speedlite 550EXs can be used as
easily as a single, on-camera Speedlite 550EX.
• Up to three 550EXs or three groups of 550EXs can be set as slave units
for automatic control.
• 550EXS set as slave units can be positioned to obtain the desired lighting
effects. All of their settings are controlled by the master unit and camera.
[1] Wireless System Setup and Testing (page 52)
[2] Wireless E-TTL Autoflash (page 60)
[3] Wireless Manual Flash (page 71)
[4] Wireless Stroboscopic Flash (page 73)
[5] Manual or Stroboscopic Flash With a Slave Unit (page 74)
This section assumes that the Speedlite 550EX is used with the EOS-3.
Before proceeding, first turn on the mam switch on the EOS-3 and 550EX.
In these Instructions, a Speedlite 550EX whose wireless selector has been set to
MASTER IS called the '"master unit” and a 550EX whose wireless selector has been
set to SLAVE is called a ‘‘slave unit,'
For EOS-3 operations, refer to the EOS-3 instructions.
With the EOS Elan II-IIE/50-50E, EOS Rebel G/500N. EOS IX, and EOS IX Lite/IX7,
only one slave group can be used for wireless E-TTL autoflash control.
Quick flash cannot be used with wireless flash photography.
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