M13, the Great Cluster in Hercules
resolution 900X6667 (cropped) pixels
imaged 09/08/2007
Ritchey-Chretien 12.5" f/6.8
SBIG STL-11000XM CCD camera internal filter wheel
LRGB 30:15.15.15 mins - 5 min subframes, Binned 2X2