Tried a couple of ways of processing this and fairly happy with this result. I need to work out how to make a mask to cover just the bluey white arms of M81 I couldn't get it to work with colour mask.
Imaging Telescopes William Optics FLT110
Imaging Camera ZWO ASI2600MC Pro
Software: PixInsight
Date: 19 Jan 2023
Frames: 121×300″(10h 5′) (gain: 0.00) -10°C bin 1×1
Avg. Moon age: 26.78 days
Avg. Moon phase:8.30%
Bortle Dark-Sky Scale: 4.00
(https://cdn.astrobin.com/solutions/images/12345/2023/6463dfeb-cb17-40f0-bd0b-af54f3454e6e-1679004211.jpg)
(https://www.astrobin.com/a1yhsc/B/)
Very nice Ivor.
I'm processing M81 M82 at the moment and I hope the galaxies turn out as well as yours.
Ivor, have you got a version without the annotation for posting on members images?
Carole
Here you go
(https://cdn.astrobin.com/images/12345/2023/6463dfeb-cb17-40f0-bd0b-af54f3454e6e.jpg)
Great image Ivor.
CS
GW