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I really can't comment on the OSC in both these make and model of cameras but what I can say is if dealer support is of importance to you, I would look at the QHY Range. Theo literally goes out of his way to keep you imaging. I can vouch for this.
As for build quality I don't think there will be anything in the two. Qhy are now made by a professional electronics company in China just as the SBIG are.
Software is supplied with both and drivers are also kept up to date for both.
My choice would be the QHY on price if for no other reason and then the follow up assistance and support given by Theo seals the deal for me.
Cooling with a 2 stage peltier capable of 50 degrees below ambient is also a very handy extra for this particular CCD. Noise free at -20 not so at -10.
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