And another try, now with ISO 400 and more total time.
GSO 305 mm - Canon Rebel XT - ISO 400 - 1 hour 15 min - 15 x 300 sec - OAG - DSI1 - Cor. Coma
large scale:
http://cdn.astrobin.com/images/29ce3...8c733c67e7.jpg
Detail in large scale:
http://cdn.astrobin.com/images/1f8b6...8ccd6df91e.jpg
To get stars with more color I think that Iso 100 ou 200 will be best with my Canon. More than those cause some saturation of the stars to white.