EXCERPT page containing first few paragraphs. 2023-10-01 09:22:04
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MTF as supplied by Fujifilm is only for wide-open performance, and presumably computed from optical designs, not measured, and it does not account for diffraction (fantasy MTF).
Overall contrast for coarse and medium structures looks outstanding.
Detail rendition (40 lp/mm) at the wide end (32mm) has some challenges into the corners. Field shooting suggests that it is much less good than alleged by the MTF chart, due to distortion correction and lens skew in most samples.
The telephoto end (64mm) claims high performance at f/4 right into the corners of the frame. In my experience, the real-world performance is more limited than claimed, especially if lens skew is present and especially after distortion correction.
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