[gbeal]

I have a couple of DSLR style cameras.
The Sony a700 is all electric. It has a remote socket, and I purchased from e bay a simple programable remote, and intervalometer style remote. Works a treat, set it and walk away.
The other camera is a Fuji X-Pro1, and is proving to be a real handy camera for "pretty picture" type astro imaging. It has a bog-standard old style cable release socket, like all cameras for old used to have. No remote socket.
Up until now I have simply screwed in a cable release, and locked open the shutter (on the B setting) and watched the timer on the LCD operate. When the required exposure is complete I trip the release to close the shutter. This is OK, but if I want to set a sequence of more than about 5 - 6 shots, it becomes a pain.

What to do?

What I want ideally is an electrical "interface". One that accepts the standard mini-jack fitting (I'd buy another remote release as my Sony style has a weird/non-standard fitting). The DIY connection would accept the electrical signal/input from the remote and transfer it into a "push" on the end of the mechanical cable release. The DIY interface could be housed and attached to the hot-shoe on the camera top.
So, while I can make the mechanical bits, the electrical side is way beyond me. I know it must be possible, but I need some pointers and suggestions.
Surely I am not the only one that has this requirement, so there could be a niche/cottage industry going here.
What ya reckon?
Gary