Greg. Thanks for the comprehensive ccd round up and your response to my thread. Choosing is not so easy given the variety and price differences.
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9 micron pixels seems to be a good one size fits all scopes type pixel size.
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I'm using Canon lenses in varying focal lengths, 100 - 400mm and thinking of a KAF8300 or KAI 8050 OSC in either the QSI, Moravian, FLI or Apogee. These sensors have 5.4 and 5.5 micron pixels and are 4/3 format. At 200mm, under my seeing conditions 5.5u is about right (according to the Apogee ccd university). At 400mm the pixels will be too small - binning can be used to 'increase' pixel size in this case. At 100mm the difference seems marginal. There are sensitivity issues as well. This part of the decision is more complex - smaller pixels or bigger pixels vs sensitivity and sampling??? Should I be looking at a larger pixel size and less megapixels (say 4) for this application?