How can I make a dual remote shutter release for Panasonic?

[Ralf]

I want to use two Panasonic DMC-GX1 cameras for my scanner. I already bought two cheap cable remotes from dx.com and now I would like to combine them so that both cameras can be triggered with one button.
The Panasonic remote works like this:

pana.jpg (27.68 KiB) Viewed 5411 times

(from: http://www.instructables.com/id/Panason ... r-Release/)

Please tell me how two connect the two cables to one remote.
Thank you very much!

[Ralf]

Here is another picture I found on http://www.robotroom.com/Macro-Photography-2.html:

Panasonic.gif (20.65 KiB) Viewed 5379 times

So it looks as if there is some voltage coming from the camera and depending on the resistance, the shutter will be released. David Cook explained it on http://www.robotroom.com/Macro-Photography-2.html:

When neither button is pressed, the camera sees 41 kilohms of resistance (36 kΩ + 3 kΩ + 2 kΩ).

When the remote focus button is pressed (similar to a half-press of the shutter button on the main camera body), electricity will flow through the focus button instead of the 36 kilohm resistor. Thus, the camera sees 5 kilohm resistance (3 kΩ + 2 kΩ).

When the remote shutter button is pressed (similar to a full-press of the shutter button on the main camera body), electricity will flow through the shutter button instead of either the 36 kilohm or the 3 kilohm resistor. Thus, the camera sees only 2 kilohm resistance.

I know almost nothing about circuits, but I think just connecting two plugs to one switch will definitely not work...

[cday]

One simple solution would be to use switches with a pair of contacts -- two-pole switches -- and then build separate circuits as above for each switch...

There may also be other solutions, possibly by simply changing (halving?) the resistor values and then paralleling the connections to the plugs, but that would need a little more thought and the result might not be entirely predictable.

Edit: Paralleling the 3.1V outputs on the plugs wouldn't be good practice, at least without adding extra components, and could possibly damage one of the cameras: the safest and sure-fire way would be to use two-pole switches.