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Hi Arnold,
You'll need to use longer exposures for your flats. The '294 and '183 series of cameras from ZWO/ASI are well known for not giving good images if the exposure time is under 3 seconds.
For my '183MC-Pro, I use 5 second exposures for the flats and dark-flats.
I can't help with the UFO-like glow in the centre of the frame - that's odd and nothing I've seen before.
Cheers,
V.
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