Yes, very difficult to process. The cluster vanishes because of the others stars. But ... it was done !
GSO 305 mm - Canon Rebel XT - ISO 800 - 26 min - 13 x 120 sec - OAG - ASI120MC - Coma Corr.
large scale:
http://cdn.astrobin.com/images/3769d...9984969_hd.jpg