Canon Speedlite 600EX II-RT Manual (en)

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Wireless Flash Photography:
Optical Transmission
This chapter describes wireless flash photography 
using the optical transmission wireless master/slave 
function.
For the accessories required for optical transmission 
wireless shooting, see the system map (p.122).
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”.