Hi Gordon,
Echoing Greg's comment - LOTS of detail in your image- in particular in the nebula, nicely done
I am using a camera with the same chip and currently shooting 15-minute subs on a f/5.6 scope. Here is an example of one of my recent images:
http://www.astrobin.com/full/189183/C/?real=&mod=
I have seen great photos taken with this chip that were composed from 30-minute subs. From closely inspecting your photograph, I believe you might have a CCD tilt that results in elongated and somehow blurred stars. But that is just my hardly educated guess...
