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Diffraction Effects at f/11 to f/16
This page assesses what happens to image quality from f/8 to f/16, the contrast-robbing effects of diffraction being the concern.
For in-depth coverage of diffraction and depth of field and more, see Making Sharp Images.
Contrast and diffraction
When I tested the Leica S2, I discovered that the lenses were so outstanding that diffraction effects were already visible at f/8, with a clear loss of micro contrast at f/11, and a very dull f/16.
Similar contrast loss should be expected from the Pentax 645D, but the degradation from diffraction depends on how good the optics are to begin with, and might also depend to a small extent on sensor technology.
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