M51 The "Whirlpool "Galaxy

          ....A 15 minute LRGB integration of 15 -1 minute exposures for the color with a Starlight Xpress MX7c ccd camera on an Ultima 11" at f3.0 . Images were aligned,dark frame subtracted and color synthesized in AstroArt 3.0 software . The Luminance was a single 10 minute integration optimized and dark subtracted in the same software . The color image and Luminance were then combined in Gimp for Windows to produce the final LRGB.