I can't see the point of this challenge....as whether you are using a Bayer matrix or filtered CCD, to get high resolution you need to oversample by a large margin. (Pixel size becomes trivial)
It then comes down to seeing (an AO would help) and to a much smaller extent tracking and and optical quality.
A sensitive web cam is the instrument of choice for long FL imaging of bright objects.
Going the other way...eg Camera lens FL territory is when pixel size affects resolution.
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