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Hmmm that is odd. Perhaps like many things in sorting problems in Astronomy, it is a multitude of causes. I have had my Astonomiks filters replaced but still see this issue to some extent. It could well be that not only are the filter sets still producing some reflection issues but also the camera reflecting a little off the imaging window and also the reducer producing reflections. In other words I think it is worth if you really are bothered by the halos and reflections to look at all those areas. It could well be a combination of all three areas.
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