Sony HVL-F36AM Operating Instructions Manual page 78

Setting wireless flash by flash only
When the flash is attached to the camera and the wireless flash set up, the
channel information is transmitted to the camera. This means that if you
continue to use the same camera and flash combination without changing
the wireless channel then you can also set the flash and camera separately
to wireless.
Camera setting:
Set to the wireless flash mode.
For details, refer to the operating instructions supplied with your camera.
Flash setting:
Press the wireless flash button to turn on the "CH1" or
"CH2" lamp.
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