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EXCERPT page containing first few paragraphs. 2021-12-02 16:35:55

Nikon NIKKOR Z 20mm f/1.8 S

Distortion and Distortion Correction

The Nikon Z7 requires distortion correction (and lateral chromatic aberration correction) for the Nikon NIKKOR Z 20mm f/1.8 S by setting a flag in the EXIF. This requirement guarantees sub-optimal micro contrast and sharpness in a substantial portion of the outer zones of the frame due to the stretching-apart of pixels, although central areas remain at least as good.

Distortion correction makes a mockery of the claimed MTF performance which becomes false advertising at best. This is shameful, but Nikon is not alone in making such claims, both the fantasy MTF aspect of computed (not measured) MTF, and the distortion correction which degrades the captured performance—always inferior to the claimed performance in a real lens mounted on a real camera. And... most users won’t care.

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Variants Uncorrected,Corrected available in full article
f8 @ 1/6 sec, ISO 64; 2020-08-15 16:44:40
NIKON Z7 + Nikon NIKKOR Z 20mm f/1.8 S RAW: LACA corrected, distortion corrected

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