So I've been having issues like the one shown below for a bit now where the flat creates this dark patch in the lower right side. Ignore the top left because I have flats that remove that correctly, the ones shown just happen to not, but the bottom right is still really bad. I use the white t-shirt over my scope and use the NINA flat automation tool so I'm not really sure what's happening. It's also worth mentioning the dark patch is always in the bottom right, doesn't matter what DSS settings use or what time of day I take the flats.
Could this be light leak in the flat acquisition process? Something I'm not thinking of. I used to take flats all the time for my Canon T3i and it was never an issue, but I have yet to take a successful flat with my ASI1600MM. This was always a pretty straight forward process so I'm a little annoyed by this after about 4 different attempts. Anyone got any ideas?
Edit: I should also note that this image is a screenshot of the DSS output with the black point brought in a bit for contrast.
Edited by Scdouglas, 11 April 2021 - 05:39 PM.