I noticed something strange on a stack, do any of you have any idea what the problem could be?
This is a stack, about 4h, taken with an unmodified Nikon Z6 + Samyang 135 f2 on a startracker. I use this combination more often, but I have never noticed this strange line. I just did an (automated) background extraction, nothing else. I also can notice this line in a single exposure:
Same for this, only ABE.
Any ideas on this?