Could that be the reason why my Z-1p usually chooses f4-5.6 when it was set to MTF mode? I always thought f8 would deliver the sharpest images for primes.A _lens_ is said to be "diffraction limited" when it is diffraction limited at its widest aperture. Strictly speaking, there are no diffraction limited camera lenses. Maybe a few enlarging lenses come close. And there are a few short teles (like the Leica 90mm Elmarit-R) that are diffraction limited at maybe one and a half stops down, which is damned good.
regards,
Alan Chan
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