Thanks for everone's replies. I discovered, much to my embarassment, that I
should of course have been focussing the telscope, not the camera, which
works quite happily set to infinity.

What I had done was focussed the scope for my eye, shoved the camera in
front, and was then trying to focus the camera !

Well now I've sussed the right way to do it, but trying to get a decent
picture with a desktop tripod 2" scope, holding the camera by hand is um,
inteersting.

Well at least I now know that huge splatter crater is Copernicus !