Godox TT600S - Custom Function-Focus Assist Lamp; Focus Assist Lamp Usage

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Godox Cells II transceiver (Optional)
TTL wireless flash trigger X1C/X1N (Optional)
To avoid overheating or deteriorating the flash head during high speed sync flash, the
over-temperature protection function will be activated automatically after 10 continuous
high-speed flashes and the recycle time becomes 10 seconds longer.
Custom Function—Focus Assist Lamp