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In my experience pixel size is irrelevant for lens imaging. I have gotten good images using 9 micron pixelled cameras with 50mm lenses.
Sampling becomes more important with long focal length. I think its somewhat overemphasised for shorter focal lengths.
For example look at the many superb FSQ106 image and 9 micron cameras.
They are not a good match sampling-wise but it makes little difference.
Try using small pixels at 3 metres focal length and you'll notice it a lot more. You'll be a lot more effect of weak seeing.
Greg.
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