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I've tried my SPC900NC for guiding and although I don't know the sensitivity numbers, the QHY5 is significantly easier to use. The combo of more sensitivity and bigger chip make it a worthwhile upgrade.
QHY5 is 6.66 x 5.32mm
Toucam is 4.6 x 3.9mm
It doesn't seem like much, but it does make a difference. I can always find a guide star with the QHY5
James
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