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I would not expect to see this in dark or bias frames. If you did then you'd suspect the camera. But in fact, your dark frame looks fine!
The gradient may well be in the optical train, or possibly due to extreme light pollution. If it is in the optical train, it should show up clearly with flat frames. If all is well you should see flats possibly with a little, ideally symmetric, darkening in the corners.
Mark
Last edited by markas; 27-08-2019 at 11:56 AM.
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