Fujifilm Fujinon XF 56 mm f/1.2 R WR
6. Distortion and field of view
Field of view
As we had photos of starry sky at our disposal we decided to measure the real field of view of the tested lens for JPEG files which, in this case, are not corrected so are able to reflect the real parameters of the lens. In order to do that we transformed the pixel layout (X,Y) from the photo into the equatorial coordinate system (right ascension and declination), which locates a star on a celestial sphere. That way we could determine the field of view of the lens with utter precision and in the right way, so for rays of light coming from infinity. Our transformation was based on over 60 stars positioned evenly across the frame and average mesh-fitting error amounted to just 5 seconds of arc.In order to determine the field of view we apply pixels positioned on extreme edges of the frame and, because of that, the fitting error might be a bit higher in that place. After comparing the result for both diagonals you can say that the final error didn't exceed a level of 0.05 of a degree.
The field computed that way amounted to 28.87 deg. It is a value a tad higher than 28.5 deg, officially declared by the producers, but the difference is small and shouldn't worry you at all.
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Distortion
The tested lens is practically distortion-free. No matter whether you work with JPEG or uncorrected RAW files, all results are, within the margin of measuring error, in accordance with zero level. Officially for JPEG files we got +0.16% and for RAW files a slightly lower result, that of +0.13%.
| Fujifilm X-T2, 56 mm, JPEG | |||
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| Fujifilm X-T2, 56 mm, RAW | |||
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