Canon Speedlite 600EX II-RT Manual (en)

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Using a Canon Speedlite (master/slave) equipped with the optical 
transmission wireless shooting function, you can easily perform 
shooting with wireless multiple flash lighting 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.96)
: Optical Transmission
Wireless Flash Photography
Positioning and Operation Range
(Wireless flash 
photography examples)
x
M
Approx. 80°
Approx.
10 m/32.8 ft.
Approx.
15 m/49.2 ft.
Approx.
12 m/39.4 ft.
Indoors
Outdoors
Approx. 
8 m/26.2 ft.
600EX II-RT
600EX II-RT
Transmission distance
 
Place with the wireless receiver of the slave unit facing the master.
 
You can also wirelessly control a 600EX II-RT set as the slave unit with a 
device that is equipped with the optical 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).