Hi Patrick, I'm probably not much help because I'm still learning. But I generally shoot the same exposure for each of the three colors. Then I think the clear should be longer, maybe three times the exposure for the others. The best way to get an idea is to look in S&T and find one of the amateur views, and the caption will list the exposure times. Good luck, Joe PS: What are you shooting? Patrick Wiggins <paw@wirelessbeehive.com> wrote: To those here that shoot tri-color CCD images: Is there a rule of thumb for how much time to be spent imaging through each filter (red, green, blue, clear)? patrick _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com --------------------------------- Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.