Bipolar Nebula NGC 6164-5 by Johannes Schedler

20 " Keller cassegrain in corrected secondary focus at f/9
SBIG STL-11000M at -15 to -20C, 8-pos STL filter wheel
Baader RGB, H-alpha, (7 nm) filters

http://panther-observatory.com/gallery/deepsky/doc/NGC6164_F9.htm