I let the camera take sub-images for an hour for this picture. I used 8 second subs with no darks at a low gain setting of 1241 (100-5000 Range.) Still lots of hot pixels without darks, but shot noise was low so I could stack lots more sub-images than this 450 stack and still be within limits.
This data was taken in the middle of a metro area with very strong light pollution. Mag 3 is the dimmest stars you can see naked eye on most nights. Not one of my best of this object because of all the LP, but it was fun to see it build up and get better and better as the subs were added in. I should have shot darks before letting it rip on this object, but I did not think I had more than 20 minutes before the Dumb Bell went behind the trees, so I skipped doing them. Oh, well… next time!
In the meantime, I added another 97 subs to this shot from a session I did last December. Here is how that turned out:
For my wide monitor, I created this composite/combined image with the data above, a set of 50×8 sec subs and 14×180 sec ISO 1600 subs from a modified Canon DSLR:
I like this one the best. 🙂