[raymo]

Hi David and Rick, SLRs and more recently DSLRs, have never been the camera of
choice for
lunar work, due to mirror, and or, shutter vibrations. Using a
remote shutter release doesn't help with those problems. Mirror lock up
does help, but you are still left with shutter vibrations.
If you are using a Bahtinov mask your focus should be spot on. If your
unsharp images are indeed due to the aforementioned problems, it is
easy to fix it. You will need to experiment with a few shots depending on
the phase of the moon. Set a very high shutter speed [say 1/3200th or
1/4000th of a sec.]. Set ISO to 1600, take a trial shot, and correct for
over or under exposure by using lower or higher ISO as necessary. This
will give pin sharp images, as the exposure is over before the vibrations
can affect the image. Don't worry about the high ISO affecting the quality
of the image; it doesn't, at least my old eyes can't see any effect. Needless to say, you must use a remote shutter release or a time delay, as has already been mentioned,the slightest touch of the camera will ruin the image.
Hope this helped.
raymo