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Hi Peter,
I'm successfully using a QHY9 with a hyperstar C8. The obstruction is around 30% by area, but the sharpness is excellent and the speed is impressive. It totally transforms the common SCT as deep sky imaging system!
However, there a couple of problems to be aware of, for example:
1. Limited image circle, the Kodak 8300 is about the largest mono chip you would be able to use. There are some f3-4 imaging systems that can cover a Kodak 16803 and so are effectively faster and wider than the hyperstar.
2. Sprite like Reflections of bright stars can be quite severe.
Terry
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