I have the QHY8 that I picked up from here for a bargain, and it is really good. I did have an issue with the CCD being slightly tilted that I fixed myself but the newer models have a tip/tilt nosepiece.
the noise is extremely low even for long subs and you don't really need darks for most targets, plus with 16bit, you can stretch images quite a bit.
very good value for money and a great starter camera for an OSC.
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