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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 main switch on the EOS-3 and 550EX.
• In these Instructions, a Speedlite 550EX whose wireless selector has been set to
is called the “master unit” and a 550EX whose wireless selector has been
set to is called a “slave unit.”
• For EOS-3 operations, refer to the EOS-3 Instructions.
• With the EOS ELAN II/ELAN IIE, 50/50E, 300/REBEL 2000, 500N/REBEL G,
3000N/66/REBEL XSN, IX, and IX 7/IX Lite, only one slave group can be used for
wireless E-TTL autoflash control.
• Quick flash cannot be used with wireless flash photography.
05. F073-E (51~) 02.4.1 2:12 PM Page 51