Fujifilm Fujinon XF 50-140 mm f/2.8 R LM OIS WR
8. Vignetting
At 50 mm focal length and with the lens wide open the brightness loss in the frame corners reaches just 12% (−0.39 EV), decreasing to an imperceptible level of 10% (−0.29 EV) on stopping down the aperture to f/4.0. For the combination of 90 mm focal length and f/2.8 aperture the vignetting is 14% (−0.44 EV). On stopping down to f/4.0 and f/5.6 it decreases to respectively: 12% (−0.38 EV) and 10% (−0.31 EV).
The vignetting increases slightly at the maximum focal length where, by f/2.8, it reaches 15% (−0.46 EV). What’s interesting its level doesn’t change almost at all on stopping down the aperture to f/4.0 and f/5.6 where it gets to 15% (−0.46 EV) and 14% (−0.43 EV) respectively. A noticeable change appears only by f/8.0 where that aberration reaches 8% (-0.25 EV).
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The real image of vignetting can be seen only in RAW files. Let’s have a glance at thumbnails below.
The fewest problems you encounter at the shortest focal length but even there, at the maximum relative aperture, the vignetting is clearly visible, amounting to 37% (−1.33 EV). That aberration decreases to 21% (-0.67 EV) after applying f/4.0. The problem becomes negligible by f/5.6 and f/8.0 where it is respectively 14% (−0.44 EV) and 9% (−0.26 EV).
In the middle of the focal range at the maximum relative aperture the light fall-off in the frame corners amounts to 39% (−1.41 EV). Then it decreases to 24% (−0.78 EV) on stopping down to f/4.0. Applying f/5.6 aperture makes the vignetting get lower to 17% (−0.53 EV). The problem becomes imperceptible only near f/8.0 where it amounts to just 11% (−0.34 EV).
The highest vignetting level you see at 140 mm where, with the lens wide open, you can lose as much as 43% of light (-1.65 EV) in the frame corners. Then the vignetting decreases a bit but that improvement is not especially sharp. By f/4.0 the level of that aberration we measured as 27% (−0.92 EV), by f/5.6 it reached 21% (-0.67 EV) and by f/8.0 it dropped to 15% (-0.46 EV). You can eliminate the vignetting completely only by f/11 where its level reaches 8% (−0.24 EV).
How the performance of the Fujinon in this category compares with that of its rivals? A duel with the Panasonic G X VARIO 35–100 mm f/2.8 P.O.I.S. ends close to a draw: the Panasonic had 40-45% of vignetting in RAW files so only a tad higher than that of the Fujinon. The full frame Canon EF 70–200 mm f/2.8L IS II USM fared better even though its task was more difficult, showing from 28% of light fall-off at the shortest focal length to 39% at the longest one. The Nikkor AF-S 70–200 mm f/2.8G ED VR II could beat that as its vignetting level never exceeded a level of 34% for any focal length. As you can see, when compared to those of professional 70-200 mm f/2.8 models, the results of the Fujinon are hardly impressive and, after all, that lens aspires to be treated as a professional device. We are not impressed - a huge APS-C lens should have performed better.
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