Fujifilm Fujinon XF 16 mm f/2.8 R WR
8. Vignetting
| X-T2, JPEG, f/2.8 | X-T2, RAW, f/2.8 |
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| X-T2, JPEG, f/4.0 | X-T2, RAW, f/4.0 |
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| X-T2, JPEG, f/5.6 | X-T2, RAW, f/5.6 |
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Keeping in mind high distortion level and a huge area in the corners which had to be cut out after its correction we expected big differences bewteen JPEG and RAW files measurements. We were right. For JPEG file format the brightness loss in frame corners would be difficult to notice because it amounts to a moderate level of 17% (−0,54 EV) even by f/2.8. On stopping down the aperture to f/4.0 the level of this aberration decreases to 12% (−0.37 EV), and by f/5.6 it reaches just 11% (−0.33 EV).
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In the case of RAW files, at the maximum relative aperture you have to deal with a high vignetting level, amounting to 48% (−1.87 EV). By f/4.0 it decreases to 30% (−1.04 EV), and by f/5.6 - to 20% (−0.64 EV). Further stopping down had just a symbolic influence because by f/8.0 and f/11.0 it reached, respectively, 19% (−0.60 EV) and 18% (−0.58 EV).
| Fujifilm X-T2, RAW, f/2.8 |
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