(0x8004040F) Arcseconds per pixel scales are not set. They are required for calculating the star-finder aperture sizes.
The plate scale properties must be set prior to calling Plate.FindIMageStars. This is requiired because the star finder apertures are scaled from arcseconds to pixels, and this requires the plate scale factors.
Copyright © 1999-2015, Robert B. Denny, Mesa, AZ