Quote:
Originally Posted by rat156
Thanks.
The reflections are not axisymmetric because they arise not on the imaging axis. I have found a couple of research papers on removing them, but none really explain why they aren't symmetrical about the star.
Someone here with more optics knowledge than I can explain it I'm sure.
Cheers
Stuart
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The 'continuum haloes' are out of focus images of reflections that arise from 'non reflecting' lens surfaces and or filters that are in your image train. This is common in mirror lens assemblies.
Modern detectors are so sensitive that there is no such thing as a 'non reflecting' optical surface where lenses/filters are involved.
The reason for being non concentric is that they are a projection of the reflecting surface and it's view of the entrance aperture of your optic in relation to the bright star's off axis position.
I hope this is clear?
bert