Lens review

Fujifilm Fujinon XF 50-140 mm f/2.8 R LM OIS WR

21 December 2014
Arkadiusz Olech

4. Image resolution

The resolution test of the Fujinon XF 50–140 mm f/2.8 R LM OIS WR was based on RAW files from the Fujifilm X-E1 camera. These files were developed with the dcraw program (with the 3-pass X-trans filter algorithm) and analyzed using the Imatest package.

Let’s remind here that the resolution of the best fixed focus lenses tested that way can go as high as 73-75 lpmm and the decency level is set near 42-43 lpmm. Now we can check how the Fujinon lens compares – the appropriate resolution graph for the frame centre at 50, 90 and 140 mm focal length is presented below.

Fujifilm Fujinon XF 50-140 mm f/2.8 R LM OIS WR  - Image resolution

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The lens’s performance is quite even but still you can notice small differences between particular focal lengths. The middle of the focal range remains the weakest, definitely weaker than both ends of the range. It’s important, though, that at the maximum relative aperture the MTFs go as high as 51-59 lpmm so distinctly above the decency level. As a result images shot with the lens wide open won’t have any quality issues in the frame centre.

The peak of its possibilities the tested lens reaches by f/4.0 and f/5.6 apertures where the MTFs can exceed 70 lpmm, momentarily being even close to 72 lpmm. It is a level very near to that of many high quality “primes” so the performance of the Fujinon 50-140 mm should be definitely praised. There are simply no weak areas in the frame centre – a round of applause!

Now let’s check the situation on the edge of the frame - the appropriate graph you can find below.

Fujifilm Fujinon XF 50-140 mm f/2.8 R LM OIS WR  - Image resolution

Once again the middle of the focal range is the weakest and here, at the maximum relative aperture, we have definitely the biggest reservations with the lens never exceeding the decency level. Fortunately that level is reached near f/4.0 and then at 50 mm and 140 mm the situation is improving further because even at the maximum relative aperture you can get fully useful images.

It is worth mentioning that on the edge of the frame the differences between particular focal lengths are easier to notice than in the centre. The 50 mm focal length fares the best - in its case the maximum MTFs reach a very good level of almost 60 lpmm.

At the end of this chapter we show crops taken from photos of our testing chart, saved as JPEG files (with the lowest sharpening level) along with RAW files, used for the analysis above.

Fujifilm Fujinon XF 50-140 mm f/2.8 R LM OIS WR  - Image resolution