Fujifilm Fujinon XF 18 mm f/2 R
6. Distortion
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When it comes to the distortion correction the Fujifilm X-Pro system decided to follow the steps of the Micro 4/3 which, in the case of wide-angle lenses, gives up the optical distortion correction completely, leaving that task to the camera’s software. Still such an approach demands a specific treatment of focal length and their image fields. Optics which distortion was not corrected has to provide a wider field of view than its nominal value, resulting from the focal length value and the size of the detector. Such a margin is necessary to correct the distortion and crop the image to required dimensions.
Such tactics is implemented in the case of the Fujinon XF 18 mm f/2R exactly. On RAW files it shows huge barrel distortion of –5.28%. As you see the optics doesn’t deal with correcting that aberration at all. Still it worth mentioning that in the case of RAW files we dispose of a field of view as wide as 80.5 ±0.1 degrees. It means the same field as in a rectilinear lens with a focal length of less than 17 mm. After the distortion correction its value on JPEG files decreases to –0.58% and the field of view gets narrower to 76.1 ±0.1 degrees and it is a good equivalent of the nominal focal length of 18 mm.
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