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Old 11-08-2015, 08:41 AM
julianh72 (Julian)
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Join Date: Jan 2014
Location: Kelvin Grove
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There's a post on the ZWO User's Group Forum on how to address the Newton's Ring issue:

http://zwoug.org/viewtopic.php?f=21&t=1408

If fixing the alignment is troublesome, there's a suggestion to take a flat frame and remove it in software:
http://www.schursastrophotography.co...rarticle5.html
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