I recently bought Asi 678MM for solar astrophotography.
After recording a video and stacking the frames, this pattern appears in the final image. It's always in the same place and always only after I significantly brighten the image (but for my purposes, I need to brighten the background, so the pattern becomes visible and distracting).
This happens when I record video with Asiair, as well as at full resolution using PC and Asi Studio.
Is this a camera defect?
