Noise problem

I have an ASI1600MC Pro.

After preprocessing in Pixinsight I get a color noise pattern. See the attached image.

I am fairly new to CCD imaging and using Pixinsight so it might just be user error.

I checked the subs before processing and they all look very clean.

It seems they are fine (after calibration, aligning, debayering) all the way up to integration.

I tried many different settings in both the batch preprocessing script, and manual Imageintegration.

Is this normal or am i doing something wrong? ;)

Thank you.

Hi there

It's a one direction field drift in imaging. I think if you open dither option in guiding will have much better result.

I am not guiding yet. These are 1 minute subs. I do not encounter this problem when I use my DSLR with the exact same setup. :

I mean the drift during entire imaging, not during single frame.

Can you put a single flat frame on drop box. gain=300, brightness 25000ADU-30000ADU.