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The camera’s built-in flash can work as a master unit for Canon EX-
series, external Speedlites having a wireless slave feature. It can
wirelessly trigger the Speedlite(s) to fire via optical transmission.
Be sure to read about wireless flash photography (optical transmission)
in the Speedlite’s instruction manual.
Regarding your Speedlite (slave unit), refer to its instruction manual and
set it as follows. The settings other than the ones below for the slave
unit’s control are all set with the camera. Different types of slave units
can be used and controlled together.
(1) Set the external Speedlite as a slave unit.
(2) Set the external Speedlite’s transmission channel to the same
channel as set on the camera.*
1
(3) For flash ratio control, set the slave unit’s firing group.
(4) Position the camera and slave unit(s) within the range shown
below.
(5) Face the slave unit’s wireless sensor toward the camera.*
2
Using Wireless FlashN
Slave Unit Settings and Position
Example of Wireless Flash Set-up
Indoors
Outdoors
Approx. 10 m
(32.8 ft.)
Approx. 7 m
(23.0 ft.)
Approx. 80°
Approx. 5 m
(16.4 ft.)
Approx. 7 m
(23.0 ft.)