EXCERPT page containing first few paragraphs. 2019-02-18 13:42:02
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With the debut of the Nikon Z system and the Nikon Z7 with its sensor needing 116 lp/mm, Nikon continues to promulgate the same inappropriate 10 and 30 lp/mm MTF charts it has for years, and for only one aperture (wide open) and without specifying spectral balance. Net/net the MTF chart offers limOited insight versus charts from Zeiss with white light made measured from actual lenses. Still, the chart is suggestive of performance at 40 lp/mm and beyond.
The computed-not-measured theoretical MTF chart for the Nikon NIKKOR Z 24-70mm f/4 S shows flatline performance wide open at f/4 cross the entire field both at the 24mm and 70mm settings.
Based on numerous aperture series, I’d say that MTF is without distortion correction because the wide end is very disappointing and the tele end is a modest performer—neither is close to my expectations. Thus the MTF is misleading, because distortion correction is required and the pixel-stretching that involves guarantees notably lower detail (distortion corrections is baked into the NEF file so that Adobe Camera Raw forces it on).
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