How does the fill light come on with the flash?

The specific operation method is as follows:

1. First, turn on the power switch of the fill lamp, and connect the fill lamp with the synchronous interface of the flash lamp through the synchronous line.

2. Then adjust the intensity adjustment knob or electronic slider lever of the fill light to make its brightness reach the required value.

3. Finally, set the flash mode (usually M or S1/S2 mode) on the camera, and the fill light will light up when flashing.