Equipment and other photo info:
Picture taken on may 27th, 2007.
Celestron C10-N @ f/4.7, Canon EOS 300D 13x300sec @ ISO800
Manually guided with Maksutov 90/1250 + Microguide EP 12.5mm
Mount: EQ6 Vis
Processing software: DeepSkyStacker, PixInsight 1.0, Photoshop CS2

Object info:
M51 was one of Charles Messier’s original discoveries: He discovered it on October 13, 1773, when observing a comet, and described it as a “very faint nebula, without stars” which is difficult to see. Its companion, NGC 5195, was discovered on March 21, 1781 by his friend Pierre M

More information about this object at: http://www.maa.clell.de/Messier/E/m051.html