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Old 22-04-2021, 08:01 AM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 8,341
Yes, Newton Rings.
I have found some key parameters which impact on the success of applying flats to full disk solar Ha images.
1. The diffusion of the material.
2. The transmission of the material.
3. The spacing of the material to the aperture.
4. The accuracy of the mount tracking
I also found flats worked better when the T2 tilter was removed.
Iím preparing a detailed write up which Iíll upload soon.
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