Messier 3
Telescope:Vixen VC200L, focal reducer f/6.4, Sphinx SXD
Camera:Canon EOS 40D, 800 ASA
Exposure:50 x 30s
Calibration:Dark (100 images), sky flatfield (50 images, low pass filter)
Image Processing:Shift & add with correction of subpixel movement, improved noise reduction
Date of exposure:10 May 2008
Software:ArgusPro SE
Remark:One frame with a satellite track was left by intention 
 
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Interstellar Gas in Cygnus