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Not exactly the same setup, but I use an Orion SSAG camera (which I think uses the same sensor as the QHY5) with PHD very successfully on my CGEM. I use the on camera guide port driving the CGEM guide input.
I typically use an exposure of around 2 seconds through a 50mm finder guide scope.
Autoguide rates and backlash settings are not particularly critical, but can be tweaked to give best results, but if the seeing is good, pretty much anything works!
-Ivan
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