Canon Speedlite 600EX II-RT Manual (en)

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60
' Radio Transmission Wireless Flash Photography
 
Shooting in a Different Flash Mode Set for Each Group 
Wireless shooting using radio transmission has advantages over 
wireless shooting using optical transmission, such as being less affected 
by obstacles, and not having to point the slave unit’s wireless sensor 
toward the master unit. The main functional differences are as follows.
*1-3: Some restrictions apply depending on the camera used.
(*1: See p.61, 79 / *2: See p.82 / *3: See p.83.)
Difference between Radio Transmission and Optical Transmission
Function
Radio Transmission Optical Transmission
Transmission distance
Approx. 30 m/98.4 ft.
Approx. 15 m/49.2 ft. 
(indoors)
Firing group control
Up to 5 groups*
1
(A, B, C, D, E)
Up to 3 groups
(A, B, C)
Slave unit control
Up to 15 units
No restriction
Channel
Auto, Ch. 1 - 15
Ch. 1 - 4
Wireless radio ID
0000 - 9999
-
Slave 
operations
Test flash firing
k
-
Modeling flash
k*
2
-
Release
k*
3
-
A
B
C
E
D
Manual flash
Manual flash
E-TTL II
E-TTL II
Manual flash
* The flash mode settings are indicated only as an example.
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