EXCERPT page containing first few paragraphs. 2021-06-13 02:09:15
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Like most brands, Fujifilm does a lame job at publishing MTF charts—wide open only, and no description of the spectral balance for the claimed performance, and it looks to be diffraction-ignoring computed fantasy MTF to boot—not measured with a real lens.
The fact that Fujifilm does not publish anything but wide open performance is disappointing, and even that is not explicitly stated.
Overall lens contrast for coarse structures over the central half of the frame is very high wide open considering that it is an f/1.7 lens. Ditto for medium and fine structures, though fine detail (40 lp/mm) really falls off outside the central 1/2 of the frame—perhaps field curvature. Note that MTF for the Fujifilm GF 110mm f/2 is superior for most of the frame and f/2 (for the GF 110/2 is reasonably close to f/1.7 on the 80/1.7, so the comparison is apt.
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