NIKON MODIFICATION for the Canon DSLR PC Serial Port Control Cable

Short Description
This document describes how to make a simple addition to the standard Canon DSLR (300D/10D, etc.) shutter release PC serial port cable, to work with both the Canon DSLR’s as well as the Nikons. All that is required is adding a tiny “pin diode” to the stereo plug, inside its housing. You don’t have to touch the interface circuit itself, or even change the 2-conductor cable, to make this a multi-camera-brand interface.

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Content
When I originally constructed the serial cable, as designed by Bill Drummond, using the Matthew Chang & Wade Calvert diagram, for their “Opto-Isolator” version, I soon discovered that it would not release a NIKON camera shutter. The problem is that Nikons require the metering circuit (Auto Focus) signal to be present when the shutter release signal fires.
My first mod to make it work with my KODAK DCS PRO SLR/n – which is based on a NIKON N80 DSLR body – was only partially successful. I added a short between the AF and Shutter release. The serial port interface did trigger the shutter, but it fired on ANY “half-press” of the shutter release on the camera, or a remote release. This was not a problem with use of programs like DSLR Focus, Images Plus, etc., since both the AF and shutter signal occurred simultaneously. However, it was annoying that I could not use AF to focus the camera lens, since focussing would fire the shutter.
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