Quote Originally Posted by Dave Mueller
From "Astrophotography for the Amateur" by Michael Covington, the rule of thumb for fixed-tripod shots of astronomical subjects:
Longest shutter speed = 250 / Focal length in mm.
For a 300mm lens, 1/2 second or faster will be enough to prevent motion blur of the Moon. You should be using mid-apertures (f/8 or f/11), so your shutter speeds should be 1/125 to 1/800 depending on film ISO, much faster than the 1/2" maximum.
Thank you. I go out tonight and shoot a test roll of the moon. I'll use tripod and all the kinds of focus I can. I'll shoot it at 1/125 @ f/8. Looking forward to try the advices from the replies to my question.

Greetings Morten