Whirlpool galaxy 10/03/2013

Four days ago I  spent a couple of hours to take 160 x 30 sec photos of the Whirlpool galaxy M51. I made it putting a Canon 1100D camera on my Celestro C8 SC telescope in piggyback position. Unlikely the night was very wet, so after 20 min the camera lens was completely covered with dew. Nevertheless 40 frames were good enough to create this image:

                      

Canon EOS 1100D piggybacked on C8 (tracking not guided)

40x30 sec frames , 30 dark, f / 5.6 , ISO 800 , macro 300mm

stacked with DSS and elaborated with Gimp