Ken,
the adapter was from Steve Mogg, so it has a small diameter "tube" where it is meant to screw into a webcam. The fibre has a metal fitting that is slightly smaller than the tube, so I used some blue-tak (
) to centralise the fibre. I also have some 500 l/mm grating film from Edmunds Optics, which I was testing last night, and if my calcs are right, and they should be because I took the time to "calibrate" the system against known lamps and optical set-ups. The end result, using 2 x 135mm lens, some 500 l/mm film, an old slr camera body to hold the exit end of the fibre and I got a resolution of 0.9 ang / px on the std 350D dslr!!
I might hold off on the grating for a little while to play around with this setup a bit more.
The major downside is that the film is not blazed, so I'm losing 50% of the light as gets diffracted
cheers
Mark