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Hi Theo,
I have never used a QHY so yes I can't really comment. The only comparison I was aware of was between the Starfish guider an the QHY guider both of which used the same chip. The QHY based on internet samples of guide images from both was a lot noisier. That was my only base for the comment. Perhaps they have improved their electronics since then as any developing company usually does over time.
Perhaps there are reviews of both from different sites - maybe Cloudy Nights or even Anacortes or OPT.
Greg.
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