Reply To: Use of more flashes

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The trigger signal to the RF-603 II has to enter through the hot shoe. The 2 sockets (3.5 and PC) are output only. I use a PC sync to hot shoe adapter like this one (the first I found online) These are available on ebay and aliexpress much cheaper.

There are 2 kinds of adapter
1 – PC Sync to hot shoe
2 – Hot shoe to pc sync
You need the first one.