M31, the Andromeda galaxy, taken with an SBIG STL11000 and a Canon 135mm/f2 stopped down to 5.6. Two filters were used, a R and a B from Astronomik and the green channel was syntetically added. Exposure times were 6x2 mins per channel.
STL 11000,Canon 135mm/f2 L guidng via Astro-Physics AP400 mount
full exif