M5 by Johannes Schedler

16" Cassegrain in secondary focus at f/10 on a MK100 GEM mount.
SBIG STL-11000M with Baader LRGB filters
Exposures: L:R:G:B = 60:40:40:40 min (5 min L, 20 min RGB sub-exposures); all 1x1.

http://panther-observatory.com/gallery/deepsky/doc/M5_F10.htm