Quote:
Originally Posted by Garyh
Thanks Mark,
I think I have seen on the net a program that actually simulates the diffraction effects for a more realistic image.
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Its called Diffract and is by Jim Burrows. I was one of the Beta testors. Search Google and you should find it. I once used that method ( simulating the shape of the actual central diffraction lines between the Ronchi bands with Diffract) to figure a couple of tiny 1.3" F3 Parabaloids as part of Gregorian beam diameter reducing telescope for the Sydney University Stellar Interferometer. A pinpoint laser source was needed to give strong clear diffraction lines. As the ROC was so short this was the very best means to do it. Even my interferometer was useless as it needed too much back focus.