On Mon, 05 Nov 2001 23:44:03 -0800, Chris Albertson <chrisalbertson90278@yahoo.com> wrote: > ... What >is needed is a better PSF model. One the uses a non-constant, >two dimensional PSFs. Hey! That's my other hobby horse you are riding!! Yes, Yes! Only PSF fitting makes full use of faint star data with a high sky background. Andrew Bennett, Avondale Vineyard