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Assuming perfect seeing, tracking etc, you want the Airy disc to be twice the pixel size to get the full theoretical resolution of your scope. This is what you would aim at for lunar, planetary etc. However, in practice, the seeing is unlikely to be better than 1-2", so 1" per pixel is probably the best you are going to get in terms of resolution. On the other hand, you may be more interested in capturing dim stuff than getting resolution, in which case larger pixels would be the go
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