Then I took two paperclips, bent one through 90 degrees and taped them together so that when one end was poked down into the carrying strap lug on the side of the camera, the other end sat over the sensor. The springiness of the paperclip means that it fits rather snugly in the lug if you choose the right size. Then I thickened the tape on the sensor-covering part with a piece of rubber (which in my case was one of those sticky thingies that stop chair legs scratching the floor). This makes sure that the fibre is held perpendicular to the sensor, and doesn't wobble around.
I used 0.2m single fibre optical cable because my local electronics shop
happened to have 6 metres lying on the bench, which they sold me for
almost nothing. But this is uncomfortably thin, being almost invisible.
If you can get thicker, that would be better.
I put blue tags on the cable for the pictures just to help you see it.
Well, I'm sure you can make a neater job than I did, but I just wanted to show how easy it can be.
An alternative way to convert the D70 remote control by wiring it to a switch on a cable can be found at : Wiring the D70 remote for external triggering
© Mark Harris 2005, but feel free to distribute without changes.