Fujifilm Fujinon XF 14 mm f/2.8 R review - Distortion

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Fujifilm Fujinon XF 14 mm f/2.8 R

17 October 2013

Arkadiusz Olech

6. Distortion

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There are only interesting results in this chapter. While testing some of the X system lenses we dealt with a situation where the RAW files distortion was huge but its JPEG correction was efficient. In the case of the Fujinon 2.8/14 the distortion is corrected by the optics very well; its value for RAW files amounted to just –0.23% which means it is practically imperceptible. We got -0.22% for the JPEG files so, within the margin of error, the value remains exactly the same like for the RAW files. A round of applause for the Fuji company for such a great distortion correction in an instrument with such a huge angle of view.

The field of view is another interesting aspect. A 14 mm focal length lens on an APS-C/DX sensor (1.5x multiplier) provides a field of view of 90.7 degrees but the producer states that the Fujinon’s field of view amounts to 89 degrees; it might suggest that the actual focal length of this instrument is a bit longer than those declared 14 mm. We decided to check it. We took a photo of the starry sky and we transformed the pixel layout (X,Y) to the equatorial coordinate system (rectascension and declination) which locate a star on a celestial sphere. That way we could determine the field of view of the lens very precisely. In the case of JPEG files it amounted to 87.4 ±0.1 degrees and in the case of RAW files – to 89.1 ±0.1 degrees. Our measurements show that the field of view of RAW files is in perfect accordance with the declaration of the producer. It means that the real focal length of the tested Fujinon is rather closer to 14.5 mm than to 14 mm.