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Lens review

Fujifilm Fujinon XF 23 mm f/2 R WR

2 November 2016
Szymon Starczewski

4. Image resolution

The resolution test of the Fujinon XF 23 mm f/2 R WR was based on RAW files from the Fujifilm X-E1 camera. They were developed by the dcraw program (with the 3-pass X-trans filter algorithm) and analyzed with the help of the Imatest package.

Let’s remind here that the best fixed focal length lenses from the Fujifilm X system tested that way are able to reach 73-76 lpmm and the decency level is situated near 42-43 lpmm. The resolution record, amounting to as much as 78 lpmm, belongs to the Fujinon XF 90 mm f/2 R LM WR.

The graph below shows MTF50 function values depending on the aperture we got in the frame centre and on its edge.

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Fujifilm Fujinon XF 23 mm f/2 R WR - Image resolution


The situation in the frame centre is very nice indeed. What’s important, images are useful already from the maximum relative aperture with MTFs reaching over 48 lpmm. The highest results the lens produces by f/4.0 – f/5.6 with resolution values hovering near 73-74 lpmm. It is a level worth a good fixed focus device and, what’s interesting, higher than that of its faster 1.4/23 brother which was able to exceed just 70 lpmm.

Still small dimensions of the lens influenced its performance on the edge of the frame and here the slower Fujinon is definitely weaker than the faster one. The maximum MTF values of the tested model barely exceeded 51 lpmm; those of the faster lens reached 55 lpmm. Still the overall situation is not bad at all. The quality of the image can be criticized only at the maximum relative aperture; on stopping down the aperture to f/2.8 the image becomes completely useful.

At the end of that chapter traditionally we present crops taken from photos of our resolution testing chart which were saved as JPEG files along with RAW files used for our analysis above.

Fujifilm X-E1, JPEG, f/2.0
Fujifilm Fujinon XF 23 mm f/2 R WR - Image resolution
Fujifilm X-E1, JPEG, f/5.6
Fujifilm Fujinon XF 23 mm f/2 R WR - Image resolution