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This scene look at the actual distortion of the Fujifilm GF 23mm f/4 using Iridient Developer, which allow processing raw files with or without lens correction (unlike Adobe Camera Raw which enforces lens corrections).
Distortion correction, mosaic
The problem with distortion correction is that it degrades micro contrast. These losses are mostly in the “stretch zone” where pixels have to be stretched apart as part of the correction. The effects will be visible in all images taken with the 23/4 and processed with Adobe Camera Raw. The degradation accounts (in part) for the modest micro contrast in the outer 1/3 of the frame with the Fujifilm GF 23mm f/4, as seen in the mosaic series.
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