Gerald correct me if I am wrong but the difference in pixel size between the 8 and 9 cameras is 2.4um (qhy 8 = 7.8um and qhy 9 = 5.4um). Both cameras can be binned as can the SBIG so I am not sure how the 9 or ST 8300 would limit you to short focal lengths. Is is always better to over sample so long as it does not get too soft.
Mark
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