Fun for Life
http://www.astrosurf.com/d_bergeron/astronomie/Bibliotheque/Traitement%20image/Pointage%20precis%20Maxim%20DL/pointage%20precis.htm
http://winfij.homeip.net/maximdl/skyflats.html
http://sites.google.com/site/photoastro13/tutoriels/flat