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Message: <blockquote data-quote="Eye-level" data-source="post: 52788" data-attributes="member: 6548">The Nikkor 28/2.8 AIS is good example of what you all are talking about...it displays a tiny bit of coma at 2.8, one stop down F4 the coma is gone and the lens is at it's peak, second stop down F5.6 the lens is already diffraction limited...so the sweet spot is one stop down from wide open...The Noct Nikkor is different than the rest...it is as sharp at 1.2 as it is at 5.6 or 8 or even 11...because there absolutely zero spherical abberation in the middle at 1.2...it is completely coma free even at 1.2...it's way more contrasty than any other Nikkor ever made...the trade off is softness in the corners plus some barrel distortion...light fall off is the only thing that is improved when you stop a Noct Nikkor down...</blockquote>