So I just got a telescope a few weeks ago and just started to try to do DSO. I'm just practicing now. My telescope is a Celestron C6se on an Alt-Az mount, so not great for photography. But the other day I managed to track Orion pretty well taking 2 second subs, and manually adjusting the tracking every 15 minutes or so. I did this for 1.5 hours and stacked the pics using DSS and edited a bit in Photoshop. Again, I'm just practicing, so I don't expect miracles, but this is the result:
Now the colors are all off, but I'll work on that later. Why do the different shades appear so much like a contour (the demarcations between shades is not smooth)? Is it something in DSS that someone has seen before? I Googled online but couldn't find anything.