NGC 7023 Iris

Please! Here is the link to the original amount:
https://disk.yandex.ru/d/Ct8obwYZ17WpTg

Darn, I don't have PixInsight! I have the original lights and calibration files, or FITS files?

Stand down, found a program to convert to FITS. With Siril and GraXpert, I got this: https://drive.google.com/drive/folders/1ToYhDxUbiT2mQWMUcguBlpWd9p05_jFl?usp=sharing
If you don't mind, I'll upload it to my gallery, crediting you as a co-author.

Please! This practice does exist here. It's just better not to list me as a co-author, but simply mention that your processing is based on my original material.

Did you use calibration files? During processing, I had a very strong feeling that either the flats were missing or they were somehow incorrect. And as far as I can tell, the focus drifted—either initially or during the shoot due to the temperature drop (which is common for long tubes).

Calibration was done! Fresh native darks and biases, as for flats—well, not exactly classic; I shot a white sheet on the observatory wall. I maintained autofocus—it was set to run automatically before starting the series and every 10 frames.
The other thing is, it was getting colder and moisture was actively settling, which caused the halos to grow.

I used to play around with sheets and t-shirts, but unfortunately they just ruin the shot. A flat panel is better—Gemini makes good ones.

I have a flat panel in my project, homemade. I already have the blanks ready.