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Setup is: AG Optical Convergent FA12 6200mm pro Chroma Ha 8nm, Oiii 5nm, Sii 5nm 50mm round unmounted filters. Telescope Express 3" focuser. ZWO EFW Zwo OAG-L This was 2 hours for each filter (Ha / Oiii / Sii) on the Jellyfish. The mirror surface of the filters is pointing away from the camera sensor towards the telescope. Propus wreaked absolute havoc on the image. Reflections everywhere in the Ha and Sii frame. Not very noticable in the Oiii frame. Any suggestions what could be causing this? Ha:  Oiii:  Sii:  |
7.90
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| Usually, it's filters. The culprit: Eta Geminorum. Having said that, your configuration is a tad exotic so I wouldn't discount the corrector as yet. I don't have the originals but you can easily figure out the out-of-focus distance from the size of the exit pupil diameter (the reflections) once expressed in mm/inch. |
16.52
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Hi Ashraf, You have the same problem as I did. Problem identified and I used a somewhat unconventional way to fix it. CS Brian https://www.astrobin.com/forum/c/astrophotography/deep-sky/unusual-ghosting-pattern/ |
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7.12
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andrea tasselli: That's what I was afraid off, thanks Andrea. So basically no hardware fix really. Just have to deal with it in post processing. Brian Boyle: Thanks for the link Brian! I guess I won't try to go crazy at this point knowing there really is no hardware fix. I already sort of processed the image in Pixinsight and I managed to mostly get rid of them, but I will definitely try that link and see if I can get a better result.  |
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Hi Arjun, I think you did a great job. And I agree you just sometimes have to accept that sometimes bright stars photobomb DSOs. Or to paraphrase a famous engineer: "you canna change the laws of physics" CS Brian |
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Brian Boyle: Thanks so much Brian. CS! Ashraf |
