I fixed it!
So excited. Finally, after so long. My elongated, blurry stars were caused by... drum roll... my primary mirror fan.
I swear I tested that on an out of focus star at the very beginning of all these issues. Maybe the star was too out of focus?
Tried it again tonight on an in-focus field at the change was immediately apparent.
So now I'm capturing some more data on NGC 5128 and it's looking much better than before. Unfortunately it's getting a bit late in the season for NGC 5128 now and we only have a couple of partially clear nights scheduled this week...
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