Took me over 4 months to get a qhy9 that worked ok. The original had lines across the screen from bright stars and I was told it was a driver clamping issue, it was a known problem. I not only had to buy another brand of camera to do imaging, I had to seek legal advise on my rights regarding the qhy9. That's about when the camera was replaced. Oh, and I had to strip, rebuild and shim an orion OAG to remove all the slop in the thing.
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