I am very interested in the QHY9.
see:
http://www.modernastronomy.com/camerasQHY.htm
It has a bit smaller sensor than my DSLR & it would be great to have a larger sensor:
Canon EOS 1000d = 22.8 x 14.8 mm.
QHY9 = Kodak Sensor Size: 19.7 x15.04mm
Does Sony make a larger sensor that is available as a mono ccd?
I have read that the Sony chips have less noise.
Choosing a mono CCD camera is a difficult task but the QHY9
seems to be excellent value for money.