Fujifilm Fujinon XF 16-50 mm f/2.8-4.8 R LM WR
8. Vignetting
That cropping and correction are so meaningful that in JPEG files you practically can't notice any vignetting at all. We don't even show any thumbnails because it makes no sense, all of hem look the same. Of course for the record we are going to show the results of our measurements.
At the 16 mm focal length and by f/2.8 vignetting amounts to just 10% (-0.29 EV) and it decreases to a completely symbolic value of 1% (-0.04 EV) on stopping down the aperture to f/4.0. In the middle of the focal range the situation is even better because even at the maximum relative aperture you deal with a completely imperceptible value of 7% (-0.22 EV). A slight increase of vignetting is visible at 50 mm – by f/4.8 it reaches a level of 10% (-0.31 EV), and by f/5.6 it drops to just 7% (-0.22 EV).
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If you want to see how the optics really deals with this aberration you have to analyse RAW files developed by neutral software such as dcraw. Appropriate thumbnails are shown below.
| Fujifilm X-T2, RAW, 16 mm, f/2.8 | Fujifilm X-T2, RAW, 16 mm, f/4.0 |
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| Fujifilm X-T2, RAW, 33 mm, f/3.8 | Fujifilm X-T2, RAW, 33 mm, f/4.0 |
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| Fujifilm X-T2, RAW, 50 mm, f/4.8 | Fujifilm X-T2, RAW, 50 mm, f/5.6 |
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It's true that this time there are more problems but the overall situation is really sensible. Obviously using a smaller sensor and an optical system well fitted to its demands has their advantages. After all on full frame constructions with similar angles of view often show vignetting on a level approaching even 3 EV. The Fujinon's performance is far from such abyssmal results.
At the most difficult combination of the 16 mm focal length and f/2.8 aperture brightness loss in frame corners amounts to 39% (-1.42 EV). A slow decrease of vignetting on stopping down can be a certain problem here because by f/4.0 you still deal with a value of 28% (-0.95 EV), by f/5.6 it's a level of 21% (-0.68 EV), and by f/8.0 you get a result of 20% (-0.66 EV). Further stopping down of the aperture doesn't provide any measureable effects.
In the middle of the focal range the performance is noticeably better. Even at the maximum relative aperture you deal with a moderate level of 24% (-0.81 EV), that decreases to 20% (-0.64 EV) on slight stopping down the aperture to f/4.0. By f/5.6 and f/8.0 we measured, respectively, 16% (-0.50 EV) and 15% (-0.47 EV).
The maximum focal length presents a very similar level to the one in the middle of the range. Here by f/4.8 vignetting amounts to 25% (-0.84 EV) and it decreases to 20% (-0.66 EV) on stopping down the aperture to f/5.6. All problems end practically completely by f/8.0 and f/11.0, where we got the following results: 16% (-0.52 EV) and 12% (-0.38 EV).
To sum up the performance presented by the Fujinon XF 16-50 mm f/2.8-4.8 R LM WR in the vignetting category we assess really well. The results at the widest angle of view are perhaps not that low but you have to remember that they concern the field of over 88 degrees, more than 5 degrees wider than in official declarations. After correcting distortion and limiting the angle of view to the one corresponding the real 16 mm focal length vignetting can be decreased to slight, completely acceptable levels that are simply unavailable for full frame lenses.
| Fujifilm X-T2, 16 mm, RAW, f/2.8 |
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| Fujifilm X-T2, 33 mm, RAW, f/3.8 |
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| Fujifilm X-T2, 50 mm, RAW, f/4.8 |
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