Canon Speedlite 600EX II-RT Manual (en)

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Using a Canon Speedlite (master/slave) equipped with the radio 
transmission wireless shooting function, you can easily perform 
wirelessly-controlled shooting with multiple flashes in the same way as 
normal E-TTL II/E-TTL autoflash photography.
The system is designed so that the settings of the 600EX II-RT (master) 
attached to the camera are automatically applied to the wirelessly 
controlled 600EX II-RT (slave). Therefore, you do not need to operate 
the slave unit during shooting.
 
Autoflash Photography Using One Slave Unit 
(p.68)
' Radio Transmission
Wireless Flash Photography
Positioning and Operation Range
(Wireless flash photography examples)
M
x
Transmission distance 
Approx. 30 m/98.4 ft.
(With 600EX II-RT)
600EX II-RT
600EX II-RT
 
You can also wirelessly control a 600EX II-RT set as the slave unit with a 
device that is equipped with the radio transmission wireless master 
function other than a 600EX II-RT. For details on setting the master unit 
functions, refer to the Instruction Manual of the device.
 
Position the slave unit, using the provided mini stand (p.16).