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Old 16-09-2020, 03:28 PM
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luka
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Image artifact

Hi,

Before wasting another night, I am looking for some advice regarding the artifacts in the images I took last night. Attached is a stack of about 2h of 120s exposures which shows it quite nicely in the top right corner.

Equipment:
RC8 + CCDT67 (1200mm focal length), luminance filter, Telecope Express OAG TSOAG9, self-made camera similar to QHY8.

The artifacts are (barely) visible in all images and flats. While CCDT67 is a new addition to the imaging train, I can't imagine how it would be causing this effect. I am suspicious of light reflecting from OAG but I don't think I can move the prism out much more. See the attached image 2.

Ignoring the dust collection and bad flats, any hints?

Thanks in advance,
Luka
Attached Thumbnails
Click for full-size image (NGC253.jpg)
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Click for full-size image (IMG_20200916_140555-e.jpg)
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Old 16-09-2020, 11:32 PM
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luka
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Answered my own question, it was caused by OAG. I moved it out by less than 1mm and the artifacts are gone.
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