I know from prior threads that some of you know a great deal about this subject. I don't know much. At f:64, what is the greatest resolution one could hope to achieve with a lens like a APO Nikkor 360 f:9? I get the impression that if th e lens is decent diffraction pretty much makes them perform similarly when stopp ed down that far. Second question...does the limitations of diffraction at smal l stops apply across the board independent of focal length? In other words, is it less of an issue with a long lens like a 400 mm than it would be with a 150, when both are at the same f stop? Please feel free to (correctly) assume I don' t know much when you answer and thanks for your advice.
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