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M33 image artefacts?
I'm puzzled by a few large round image artefacts that appear in the lower right corner of my image of M33. After careful inspection of my imaging train (telescope, ccd, reducer/ flatterner, filter), I couldn't find anything to explain them.
The technical info:
TV85
TV reducer/flattener 0.8
Optolong L-pro
ZWO ASI533MC Pro
35x300s lights dithered
No calibration frames
The attached image is only DBE and non-linear stretched in PixInsight
Bortle class 6
30-40 degrees above the city skyline
Any suggestions would be appreciated
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