Canon Speedlite 430EX III-RT Instruction Manual - Page 71
Wireless Flash Photography: Optical Transmission
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5 Wireless Flash Photography: Optical Transmission This chapter describes wireless flash shooting using the optical transmission wireless slave function. For the accessories required for optical transmission wireless shooting, see the system map (p.90). 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 , , , , or (Creative Zone mode). The optical transmission wireless slave function is available with both Speedlite 430EX III-RT and Speedlite 430EX III. You can wirelessly control a 430EX III-RT/430EX III set as an optical transmission wireless slave unit using a device equipped with the optical transmission wireless master function (p.91). The device equipped with the optical transmission wireless master function is called the "master", and a 430EX III-RT/ 430EX III that is controlled wirelessly is called a "slave". 71