Fujifilm Fujinon XF 18 mm f/1.4 R LM WR
8. Vignetting
| X-E1, JPEG, f/1.4 | X-E1, RAW, f/1.4 |
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| X-E1, JPEG, f/2.0 | X-E1, RAW, f/2.0 |
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| X-E1, JPEG, f/2.8 | X-E1, RAW, f/2.8 |
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It is clear that vignetting is corrected on JPEG files and you can't switch that process off. As a result its level is rather low. By f/1.4 brightness loss in frame corners amounts to 27% (-0.90 EV) and it decreases to 18% (-0.58 EV) on stopping down the aperture to f/2.0. By f/2.8 and higher apertures vignetting keeps the same level of 13% (-0.42 EV).
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Only while examining RAW files you can see the real level of this aberration. At the maximum relative aperture it amounts to 48% (-1.87 EV). It's a high value but, if you take into account the aperture fastness and angle of view, you can say the Fujinon still managed to emerge unscathed. Especially that by f/2.0 vignetting decreases to 38% (-1.18 EV), by f/2.8 it drops to 26% (-0.86 EV), and by f/4.0 it is diminished even a bit more, to 25% (-0.85 EV). Further stopping down doesn't have any measureable influence on the aberration described here.
| Fujifilm X-T2, RAW, f/1.4 |
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