[OM] Flash synchronization socket?

[M. Royer]

It appears to me that there are two sockets on my OM-4
and 4T for flash. One is the normal 5 pin OTF socket
which I use for T-series off body  flash. The other is
a "flash synchronization socket" that is near the
b-lock button. What exactly is this socket used for?
The 
QA 310? Thank you for your time and answers.

Mark Lloyd

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