Hi,

I'm trying to trigger six Panasonic Lumix G7 cameras at once.

The trigger mechanism uses a four pole 2.5 mm plug, some resistors and two switches. With no switch closed there is 41 kilohms of resistance. To trigger the focus, you reduce that to 5 kilohms. To trigger the photograph or video start you allow 2 kilohms of resistance.

So much I learnt from this great blog post: Panasonic Lumix G1 GH1 Remote Shutter Release Circuit - Robot Room

Wired this way it triggers a single camera just fine. However, when you add additional cameras to the circuit, it doesn't work anymore. I'm guessing that the resistance is no longer correct, because now a focus trigger does nothing (I think) and a shutter release trigger makes the camera focus.

When I was 11 I was the proud owner of a Smith Electronics Funway into Electronics set. I'm afraid I've learnt nothing much since.

Any way to wire this up so that the resistance is correct for all the cameras? Ideally I could add more than 6 cameras in the future following the same method.

My fall back are independent circuits with a mechanical switch closing them all independently, but 1/100 second accuracy would be a big help here, so I'd love to do it right.

Cheers,

Red