Porr images with 20D/C90

I have a relatively new DSLR and an old (~ 1980, black tube) Celestron
C90. The other light I tried taking a picture of the full moon with
the camera at prime focus (tripod, ASA 400, 1/300, remote release
after ~10 sec of MLU), and the results were well-exposed but very
fuzzy. I thought that perhaps the 'scope was damaged or had
deteriorated in some way, but visual observations (30mm Kellner) look
very sharp. So, I have a few questions:

1. Is it normal for lunar astrophotographs to have much lower
resolution than visual images?
2. Since the 'scope focus "beyond infinity", it is very
difficult to focus on the screen in a Canon 20D. Do you have any tips
for manual focusing with a DSLR, or is it largely trial and error?
3. The tripod I was using was an old, cheap Velbon (~$25 new) I
bought for a video project, and is none too stable. If you touch the
'scope at all the image dances all over the place. After some
research, I've ordered a Bogen / Manfrotto 3246 with 488RC2 Midi
Ballhead that will be used primary for daylight photography, but it
hasn't arrived yet. Would you folks with experience expect this to
be any better?

I understand that the 'scope is not the greatest, and this was my
first try at lunar imaging, but my images look nowhere near as good as
those I've seen from similar setups. I don't expect miracles, but
these pictures are pretty sad. Any suggestions?

.

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