Canon Speedlite 600EX II-RT Manual (en)

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When using an EOS DIGITAL camera released in and after 2012 (except 
EOS REBEL T6/1300D and EOS REBEL T5/1200D), you can perform 
linked shooting, which automatically releases the shutter of a slave 
camera unit by linking it to the master camera unit. You can perform 
linked shooting with up to 16 units, including both master units and slave 
units. This is useful when you want to shoot a subject from multiple 
angles at the same time.
To perform linked shooting, attach a Speedlite or a Speedlite 
Transmitter that supports radio transmission wireless shooting to the 
camera.
Note that when used with a camera released up to 2011 or with EOS 
REBEL T6/1300D or EOS REBEL T5/1200D, the unit can be used only 
as “master camera unit”. The unit cannot be used as a “slave camera 
unit”.
Linked Shooting with Radio Transmission
Slave
camera
unit
Slave
 camera
unit
Slave
camera
unit
Slave
 camera
unit
Transmission distance 
Approx. 30 m/98.4 ft.
Master 
camera 
unit
The combination of an EOS camera and 600EX II-RT set with linked 
shooting function is called either “master camera unit/master unit” or “slave 
camera unit/slave unit”.