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Hello E.
I have never understood, nor taken the time to analyze those pixels to focal length rules.
If it helps, my QHY8 works well with the likes of my 10" 5 newt (1250mm focal length), but has worked equally well with an FS102 (800mm focal length), and is at the moment going very very well with my 80mm triplet (without reducer 480mm and with reducer about 380mm focal length).
Great camera for the money.
Gary
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