I'm pretty sure there's been a thread here before about using a QHY5 on a 50mm finderscope. Certainly possible with the sensitivity of the camera. People that have done it seem to invest in a good quality fixed mounting for it.
http://www.kwtelescope.com/KWT_KWIQ.htm
http://www.cloudynights.com/ubbthrea...9/Main/2696044