EXCERPT page containing first few paragraphs. 2023-12-02 01:22:34
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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 3/4 of the frame is outstanding.Ditto for medium and fine structures, though fine detail (40 lp/mm) really falls off outside the central 2/3 of the frame—perhaps field curvature.
The rolloff to the outer zones looks like field curvature. The curvature is likely to to closer range, that is, peripheral forward field curvature. Peak performance overall is likely at f/5.6, and probably mandatory for corner performance, perhaps even f/8.
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