Strange interference pattern via Starstax

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starman1969
starman1969 Veteran Member • Posts: 4,336
Strange interference pattern via Starstax
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I don't tend to do star trails anymore, but I did happen to do one the other night when we had a rare opportunity for a long clear spell. It was actually the peak of the Orionid Meteor Shower, although we never saw any, despite hours out in these conditions.

Anyhow, I noticed a strange semicircular interference pattern which affected this star trail image after stacking around 150 frames. I've included a stack of 3 frames, where the pattern is reduced. I've also included a single frame to give an idea of how it should look. Just wondering what I can do to avoid this. I can blend a foreground from the three stack image, but it seems a bit of a pain to have to do that.

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Steve

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