andyofastro Posted February 19 Share Posted February 19 Any ideas what is causing the large ring in my images? It is a 200PDS with a 269C camera, Baader Coma Corrector, L Pro Filter. I don't believe it is light leaks, the primary is covered up, focuser is covered up with felt and taped up at all joins, massive dew/light shield is used to stop stray light as well and most importantly, it is not present on individual subs. I have retaken all calibration frames, including flats, short flats, long duration flats, Darks, Dark Flats etc. The only other report of this I can find is on astrobin: https://www.astrobin.com/.../help-please-some-circle-is.../ There was no resolution described. It wasn't a 200PDS it was a 200P but very similar. Thank you for any assistance you may be able to offer. Link to comment Share on other sites More sharing options...
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