@paul04 That's a nice picture Paul. I have tried and tried to the point of pretty much giving up, but why is it so damn hard to get a sharp picture of the moon?
Because most camera lenses are not designed to take pictures of celestial bodies, depending on the phase of the moon it well effect the exposure, but try from 1/30th to 1/250, also avoid shooting wide open as the lens will be quite soft unless a top end lens ( a bit like bikes), larger sensors will also help i.e Cannon EOS 5's and 1's, shoot ing the full moon will not produce good results as the light is pretty flat.
Obviously the longer the lens the more it will help, half frame sensor like the EOS X**, X* can be useful as they just use the central portion of the lens so avoiding the softer edges, and finally make sure its on a rock solid tripod with either a remote release or shoot on the self timer, and also with mirror lock up if available, this is one of the best I managed with an old EF70-210 lens, the Orion nebula and the pleiades are from separate images but with the same lens.
Main image, 1/250th @ f8.0, I.S.O. 100,, hope this helps.
One other thing don't use A.F. and if you have live view use that to zoom in to focus.
and no that is not a star shining through the Moon, can't remember the name of the crater.