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One thing is the article kind of assumes DSLRs or Kodak CCDs. They have relatively high read noise. The Sony read noise is a fraction of the Kodaks and this allows higher res using smaller pixels to some degree.
Interesting point about showing up guide errors more with oversampling. I would not have thought of that as an issue. Not sure I have seen it myself though with different camera setups. Round stars are sometimes an illusion in the sense that the star has been moved around evenly during the course of the exposure rather than a regular drift in one direction causing eggy stars.
Greg.
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