Sony Alpha 9 - Manual (Page 137)

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Set up an off-camera flash that is set to wireless mode, or that
is attached to the Wireless Radio Receiver (sold separately).
• Press the AEL button on the camera to perform a test flashing.
Setting of the AEL button
We recommend that you set MENU  (Camera Settings 2) 
[Custom Key (Shoot.)]  [AEL Button] to [AEL hold] when performing
wireless flash shooting.
Note
• The off-camera flash may emit light after receiving a light signal from a flash
used as the controller of another camera. If this occurs, change the channel of
your flash. For details on how to change the channel, refer to the instruction
manual for the flash.
• Two flashes (a controller and an off-camera flash) are required for light signal
wireless flash shooting.
• HVL-F20M can only be used as the controller.