Here is my attempt at Simeis 147. It didn't turn out as well as I hoped but I'm calling it a day on this one. I had to crop the color version (HOO) tighter than I wanted to because of a reflection from a nearby bright star in my O3 subs. The HA only version has the full field I was going for. Also, I had a heck of a time getting the mosaic panels at the same brightness and I still see seams in the 4 panel mosaic. I think the fact that you have to stretch this one so hard reveals a lot of imperfections. Maybe I'll try this one again sometime with a wide angle lens so I don't have to do a mosaic.
Anyway, here it is and thanks for looking. The object itself is very cool - a 40,000 year old supernova remnant about 3,000 light years from Earth.