Messier 101

Telescope:Vixen VC200L, focal reducer f/6.4, Sphinx SXD 
Camera:Canon EOS 40D, 800 ASA
Exposure:300 x 30s 
Calibration:Dark (200 images), Flat (100 images, low pass filter) 
Image Processing:Shift & add with correction of subpixel movement, improved noise reduction
Date of exposure:21 April 2009
Software:ArgusPro SE
 
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Interstellar Gas in Cygnus