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The ASI cameras like the 120 are prone to presenting Newton Rings in Ha.
I'll find an example... but they appear as regular dark/ light bands across the whole image.
The cause is interference of the monochromatic light between the cover plate and the CCD chip in the camera.
The only solution I've seen so far is to slightly tilt the camera relative to the optical axis to change the effective thickness of the cover plate.
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