Canon Speedlite 600EX II-RT Manual (en)

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Wireless Flash Photography:
Radio Transmission
This chapter describes wireless flash photography 
using the radio transmission wireless master/slave 
function.
For the accessories required for radio transmission 
wireless shooting, see the system map (p.122).
For the regions of use, restrictions, and precautions 
related to radio transmission, see page 139.
When the camera’s shooting mode is set to a fully automatic 
mode or a Basic Zone mode, the operations in this chapter are 
not available. Set the camera’s shooting mode to <d/s/f/a/
bulb(B)> (Creative Zone mode).
 
The procedures for wireless flash photography are described, 
using the 600EX II-RT for both the master and slave unit.
 
The 600EX II-RT attached to the camera is called “master”, 
and the 600EX II-RT controlled wirelessly is called “slave”.