M33 with the ASI183MC

[michael.h.f.wilkinson]

First deep-sky attempt with the ASI183MC, APM 80 mm F/6 triplet, and 0.6x focal reducer. I used the ZWO Mini-EFW with L-band filter to reach (roughly) the right distance from flattener to the sensor. This results of 1h worth of 30s lights, 20 darks and 40 flats.

As can be seen I had problems with the original set of flats I got, so took new ones, but there are still some annoying gradients I cannot seem to get rid of. Star shapes are not that good in the outer parts. I must definitely look at the spacing again. Cropped, the result is noisy, but OK for just 1h

[MartinB]

I'm looking on my laptop which isn't showing the background gradients/artefacts.  I think your solution is a cheaper monitor!!!

[michael.h.f.wilkinson]

2 hours ago, MartinB said:

I'm looking on my laptop which isn't showing the background gradients/artefacts.  I think your solution is a cheaper monitor!!!

I did my best to mask the artefacts by darkening the background. Apparently, my cunning plan has worked