I got this from the yahoo toucam group and it is a tutorial for the want of a better word given by Eric Ng of Hong Kong who has arguably the best images on the net, taken in real ordinary conditions. It is a WMV file and probably best if you have broadband. Very informative in particular relating to ringing problems with Jupiter.
http://www.qcuiag-web.co.uk/QCUIAG-2...05_Eric_Ng.wmv

Peter