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>> concern about large versus small pixels in relation to seeing (snipped)
Yes, the system with pixels of smaller angular size on the sky should
yield higher precision in principle. One way of improving things for systems
with large pixels is to take multiple images. For instance, if I were
running such a system, I would have it take back-to-back pairs with a
command to shift the camera slightly (10"-30") between exposures. I would
want to take pairs of frames anyway to guard against chip flaws, cosmic
rays, etc. Another route (at least in survey mode) is to arrange the
field centers to provide center-to-corner overlap (the center position of
one frame corresponds to the corner of a frame taken in any diagonal
direction). This provides the multiple coverage and random pixel sampling
without reducing sky coverage so much (I wouldn't consider a little
redundancy as wasted time in variable-star photometry).
\Brian
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