I am pretty pleased with this result. Eleven images 60 seconds each at f/3.5 ISO 800 shot at 50mm and cropped. Processed with pixinsight using guidance from Alan Hall’s book. After stacking with pixinsight The image had a greenish tint and I eliminated that by using the color slider in the windows photo tool, then used the brightness slider to reduce brightness a bit. That’s a crude tool but i’m happy with the result.
Above M31 you can see M110 and the greyer “star” below it is M32. The two brighter stars midframe are v Andromeda and 32 Andromeda. Near the bottom center us u Andromeda.
Below, for reference is IMG_3963, one of the 11 frames stacked to generate the picture in its original size and roughly cropped to match the above.
I now have a 135mm lens which I intend to try on the next good evening. Assuming I can do 60 second exposures I would need higher ISO to get the same brightness because the lens is f/5.6 rather than the 3.5 I was using for the above. According to this I think the brightness ratio is (5.6/3.5)^2 or about 2.5 so I will try ISO 1600 for 75 sec and if that’s no good, ISO 3200 for 37 sec.
Astrophotography Newbie 