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As you can see, the worst optic is the weak link in the chain, because its waveform error so dominates the better optic's. If one mirror was perfect and the other had lambda 1/5 errors, it's easy to see that the resultant error will also be 1/5 lambda.

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Can we include atmospheric turbulence also into the optical chain? And would an observer have any benefit of diffraction limited optics when the seeing is average? If so, the not so perfect mirror might not be the weakest link in the chain?

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Rony

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