Several articles at diglloyd.com have discussed diffraction. See also my Jan/Feb 2009 article in Photo Techniques magazine: Diffraction — Resolution Taxed to Its Limits.
With the groundbreaking resolution of the D3x, it’s natural to ask what the aperture limits are for optimal results, a factor to consider when making real images. The good news is that the D3x images hold up very well when stopping down. The bad news is that diffraction is an inviolate law to which the D3x is subject, like any other DSLR.
This series was taken with the Zeiss ZF 100mm f/2 Makro-Planar, which offers a flat field, and exploits the D3x sensor across the entire frame, even wide open. Crops are from near the center.
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