Hey there. I do a lot of untracked astrophotography, and it’s not every time, but I’ll occasionally get a very strange result from registration: I’d like to know if anyone else gets this, and if it’s something I’m doing incorrectly. I’m not using any preprocessing other than directly debayering.
Here’s what I’m talking about:
I’m noticing that the period of this artifact actually increases as the registered image gets farther away from the reference image (and Siril, therefore, has to move pixels more to accurately register them). Could this be due to a lens distortion that isn’t correctly from applying flats? I actually think I’ve seen this error in flats on an old set of data, too, so maybe it’s not to do with that.
This is shot currently on a Minolta 200mm f/4 with a Fujifilm X-T1, untracked, on a tripod. If I stack enough images, the artifact doesn’t seem to matter, but I’d obviously like to take care of it instead.