Does anyone know what is the required input sync voltage on the PC Sync terminal of the GFX 100? I was not able to find it in the user manual. I'm shooting with robotic panoheads that can sense the shutter state using the PC Sync port. One of them uses 4.7 V and it works with the GFX 100. The other uses 3.3 V and does not work. Sorry to post this here but there is no GFX 100 forum.