Canon Speedlite Transmitter ST-E3-RT - Manual (Page 45)

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Linked shooting is a function that automatically releases the shutter of a
slave unit camera by linking it to a master unit camera. You can shoot
with linked shooting for up to 16 units, including both master units and
slave units. This is convenient when you want to shoot a subject from
multiple angles at the same time.
To shoot with linked shooting, attach a flash that supports radio
transmission wireless shooting or the Speedlite Transmitter ST-E3-RT
to the camera.
Note that when using a camera with an N3 type remote control terminal
that was released up to 2011 as the “slave unit camera,” the “Release
Cable SR-N3” (sold separately) is needed. For details on attaching the
cable, see page 42.
Before performing the operations on the next page, attach a transmitter
or Speedlite on all the cameras to be used for linked shooting. For
details on the Speedlite settings, see the Speedlite’s instruction manual.
Linked Shooting
Master unit
camera
Slave unit camera
Slave unit camera
Slave unit
camera
Slave unit
camera
Transmission
distance
Approx. 30 m
(98.4 ft.)
COP
Y