Grainy rings on photos after stacking StarryLandscapestacker

Question

I am having an issue that I am hoping for help here.  I take astro pictures using:
Nikon D850 with a Sigma 14mm F1.8 Dg ART lens on a tripod.  I usually take a 6-10 images of the the night sky and denoise with a stack in starry landscape stacker (SLS).  Every once is a while after stacking in SLS I end up with a photo with grainy ridges and rings. Any idea what could be causing this?  The exposure here is ISO 6400 for 13 seconds at F1.8.

Inquisitive_Torquemada · Answer

Are you sure you're setting White Balance manually? I think this may be related to differences in Auto White Balance color temperature between the shots.

Pete · Answer

This could be, as already pointed out, effects triggered by the initial processing of the images.
The web site has instructions for how they should be pre-processed before loaded into SLS:
https://sites.google.com/site/starrylandscapestacker/preparing-images-for-starry-landscape-stacker
In summary, they are:

reduce the contrast
turn off sharpening and noise reduction
apply lens chromatic aberration corrections - but turn off all other lens corrections
Set custom white balance

Grainy rings on photos after stacking StarryLandscapestacker

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