Wired Shutterrelease mechanical to USB in macro

brnrds

Senior Member
I'm working with a semi automatic bellow on my D750 for macro photography.
The dual mechanical shutter release can activate the diaphragm on the bellow.
However I'd also like to couple the second release-cable to the electronic mini USB input on the camera.

I somewhere saw such a device but can't find it any more on the internet.
Anyone any idea's?

(Thinking about a home build device, with a standard cable-adapter and a kind of switch on a plug in).
 
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