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I just googled Nyquist rule and its at least 2X. So that would be the minimum in order to reconstruct the signal.
I suppose that is why I have seen it expressed as 3X to allow a margin as 2X is the absolute minimum.
So with that then if you are matching a specific scope you can work it.
Your DSLR is already a bit more than 2X and it seems you are on safe ground there.
KAF8300 chip is 5.7 micron pixels so that would be one choice. That is the chip in the SBIG ST8300, FLI Microline 8300, Apogee U8300,QSI583 and Starlight Express and QHY cameras.
QHY is cheapest, SBIG ST8300 probably next cheapest. Then perhaps Starlight Express then Apogee and then FLI (the best).
Greg.
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