One of the most detailed spiral galaxies for amateur telescopes is M66 in the Constellation of Leo. This is the first tri color image of a galaxy with the 12.5" at prime focus. Note the pink hydrogen clouds in the bluish arms, congested by O-B associations. Seeing was as good as it gets from here in Payson.
Instrument: 12.5" f/5 Newtonian CCD Camera: SBIG237 Exposure: L=40mins, R=10m, G=7m, B=12m (Binned 2x2) Filters: RGB Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing 8/10, Transparency 6/10 Temperature: 22 F