NGC 6744 in Pavo. A huge (about 24 min arc top-to-bottom) very bright (mag 8.5) delicate face-on barred spiral. Because it has such a large area the surface brightness is quite low (about mag 14/sq arc min), not much above the airglow, making the northern spiral arm (which scrapes the top of the image) very hard to photograph. The main galaxy is interacting with a Magellanic style irregular companion at 2pm. There are many dozens of small background galaxies discernible. North up. Monochrome 10 hrs, RGB 2 hrs each.
STL-11000M on 20" PlaneWave CDK on MI-750 fork. All control electronics, firmware, and software, and all image processing software, done in house.