Panasonic Lumix S1R Operating Instructions Manual page 217

Connecting a Synchro Cable to the Flash Synchro Socket
You can use a commercially available external flash by connecting a
commercially available synchro cable to the flash synchro socket.
The socket has a lock screw to prevent the cable from falling off.
Before connecting the synchro cable to the flash synchro socket, remove
the flash synchro socket cap.
Use an external flash with a synchronisation voltage of 400 V or less.
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Do not use the synchro cables with the length of 3 m (9.8 feet) or more.
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1
Rotate the flash synchro socket cap in
the direction of the arrow to remove.
Be careful not to lose the flash synchro
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socket cap.
2
Connect the synchro cable to the flash
synchro socket.
For the connection, refer to the operating
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instructions for the synchro cable.
The flash synchro socket has no polarity. You can use a synchro cable
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regardless of its polarity.
10. Flash
217