Canon EOS 7D - Manual (Page 123)

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The camera’s built-in flash can work as a master unit with Canon
Speedlites having a wireless slave feature and wirelessly trigger the
Speedlite to fire. Be sure to read about wireless flash photography in
the Speedlite’s instruction manual.
Regarding your Speedlite (slave unit), refer to its instruction manual and
set it as follows. Slave unit control settings other than the below are all
set with the camera. Different types of slave units can be used and
controlled together.
(1) Set the Speedlite as a slave unit.
(2) Set the Speedlite’s transmission channel to the same one as
the camera.
(3) If you want to set the flash ratio (p.128), set the slave unit ID.
(4) Position the camera and slave unit(s) within the range shown
below.
(5) Face the slave unit’s wireless sensor toward the camera.
Using Wireless FlashN
Slave Unit Settings and Position
Approx.
10m
(32.8ft.)
Approx.
7m
(23.0ft.)
Approx. 5m
(16.4ft.)
80
o
Approx. 7m
(23.0ft.)
Wireless flash set-up example
Indoors
Outdoors
The camera’s master unit function cannot be used for wireless flash
shooting with radio transmission.