That's a nasty artefact in the dark. Hope its consistent, otherwise would be hard to compensate. I had a look at the dark on the zwo website and its flat over the whole image when highly stretched.
Quote:
Originally Posted by The_bluester
They look like pretty typical darks for the ASI294. I had one before I went to an ASI2600 and the darks form it looked the same as that, and the ZWO web page for the ASI294 showed the same. A master dark made from a good number of darks should subtract out the starburst from light frames nicely.
This is a 300 second master dark from my ASI294.
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