I noticed my flats (that auto exposed at 300ms) at gain 121 have a large round white glow in the centre of the stretched preview. This same glow appears in shots of deep sky as well.
The 120second darks also have a strage artifact in the centre of the image.....
is the sensor damaged?
Last edited by bertinspace; 12-06-2024 at 08:22 PM.
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.
After some experimenting.....the vignetting is normal and just exagerated by the auto stretch in ASIair. After stacking and adding to final stack the flats worked perfectly