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This also highlights something else - we have to be even more critical in the collimation, cooling, etc of the scopes, because there is the potential to see detail way smaller than the airy disk, or rayleigh criterion. It would an error to use the airy disk size as a criterion to judge whether you have the scope "close enough" in setup, it may be better to use 1/4 this size or something as I think that is closer to the true resolving power on extended objects like planets.
regards, Bird
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