Andromeda night

Yesterday night I wanted to obtain a long exposure of M31. The sky was quite good, clear with a decent seeing.. So I programmed the Canon for 100 shoots of 2 min each (total 3h 20 m). I went inside to play chess. After one hour I checked the sky: it was cloudy :-(
Only 25 frames were good enough to be processed and this is the result

M31 - Andromeda

Canon EOS 1100D piggybacked on a GE mount (no guide). 200mm macro lens, f/5.6, ISO 800, 25 x 120 sec RAW frames + 5 dark frames elaborated with DSS and Gimp.