I am experiencing some issues with my Pier 5 datasets and hope you have a solution for that ;-)
After the stacking process one of my first steps is the background extraction to remove the slight vignetting wihich is still left in the images.
No matter what tool (PixInsight, AffinityPhoto) or method (DBE, ABE, manually) I use, I always have those large ring artefacts afterwards. This is kind of annoying and takes me forever to manually remove. I am not having such issues with Pier 1 data for instance.
I am pretty sure I use the correct Dark and Flat files from the time the images were recorded.
The ring artefacts exists in almost every dataset I worked on lately, so this is just one example but looks pretty much the same on other images as well.
Any ideas? Do you face the same problems? How do you solve it?