Wireless Flash Photography - Canon EOS 77D Instruction Manual

Wireless Flash PhotographyN
The camera's built-in flash can work as a master unit for Canon EX-
series, external Speedlites equipped with a wireless slave feature. It
can wirelessly trigger the Speedlite(s) to fire via optical transmission.
Be sure to read the instructions and cautions about wireless flash
photography (optical transmission) in the Speedlite's instruction
manual.
Slave Unit Settings and Position
Regarding your Speedlite (hereafter 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 models of
Speedlite slave units can be used and controlled together.
(1) Set the external Speedlite as a slave unit.
(2) Set the Speedlite's transmission channel to the same channel
as set on the camera.
(3) For flash ratio control (p.237), 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.
Indoors
Outdoors
*1
Example of Wireless Flash Set-up
Approx. 80°
Approx. 10 m/32.8 ft.
Approx. 7 m/23.0 ft.
Approx. 5 m/ Approx. 7 m/
16.4 ft. 23.0 ft.
*2
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