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Thanks for that Guy.
16801 is very expensive, a Proline with that is around $20K. You are nearly at those 96%QE back thinned E2V sensors at that price.
STX, Microline, Proline are similarly priced. STX main advantage is self guiding. It seems electronics and cooling are similar with STX as well.
Provision for a 2nd guider if using a guide scope is an edge for STX.
I haven't heard anything about the artificial star STX guiding yet.
Perhaps that never eventuated.
Greg.
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