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Old 18-07-2019, 04:59 PM
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Atmos (Colin)
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Atmos is offline
Join Date: Aug 2011
Location: Melbourne
Posts: 6,868
Although Glen is correct with the ASI1600 microlens issue which is visible in the Lum sub, the reflections in the Ha are entirely different and a filter issue.

Paul is correct in that ZWO agave released some new narrowband filters with better coatings. Not sure how the new ZWO filters compare to the Astronomik ones but either of them is going to produce less reflections than your current narrowband set.
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