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This stretched integration (without any post-processing) was taken over 3 nights. There were clouds passing through and the moon was about 70-85% full. Anyone know what these gradients are? The were not on the original subs. at least not when using Screen Transfer Function to view them, so either it's my flats or something in processing. I was able to remove them in post-processing, but I want to know what they're caused by.  Here's the version I came up with from these subs: https://www.astrobin.com/cigrit/ |
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That's galactic cirrus and you shouldn't zap it.
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andrea tasselli: Interesting. If I knew they'd been there I'd increase my exposure time to 12 hours. It's not too late. I re-processed it and left the galactic cirrus in. Thanks for pointing that out to me. |
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You have to be careful with background extraction because as you've seen in your case, it can and will, at times, try to remove real data.
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You have to be careful with background extraction because as you've seen in your case, it can and will, at times, try to remove real data. Lesson learned! Although the Background Extraction was not the culprit here. The culprit was me, thinking it was a gradient. I removed it by hand in post-processing. Now it looks better:  |
