Hi guys,
You have to look at this site!!!!! Its the best I have seen of the moon using camera lenses as compared to telescopes; these moon shots were taken stacking TC converters one on top another using a Sigma 300-800 f/5.6 lens. Romy is a very good and interesting photographer and I think a lot can be learnt from him........
http://www.pbase.com/liquidstone/moon_shots
Regards
Jonathan