I think there is an interesting image to be had of the Coma cluster.
You can't see all the galaxies in the Telescopius view, so I am attaching the Stellarium view. There are many more galaxies int eh field if you zoom in.
I would centre the frame on NGC 4889 (Coma B). There are some bright stars in the field so I would suggest 120 sec subs and 2 hours integration.
What do you think?