Fujifilm Fujinon XF 8 mm f/3.5 R WR
8. Vignetting
| X-T2, JPEG, f/3.5 | X-T2, RAW, f/3.5 |
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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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It's clear that vignetting is corrected in JPEG files and you can't switch that process off. What's more, images after distortion correction are additionally cropped. As a result vignetting values for JPEG files are moderate – at the maximum relative aperture this aberration reaches 22% (-0.73 EV), by f/4.0 it decreases to 17% (-0.54 EV), and by f/5.6 it drops to a quite imperceptible level of 10% (-0.32 EV).
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Only by analyzing RAW files you can discover a real level of this aberration. At the maximum relative aperture the vignetting is 51% (-2.05 EV). It's a lot but, taking the parameters of the tested lens into account, also a nice surprise. After all on RAW files you do get these several degrees of field of view more. If you limited the field to a value stated in official specifications, corresponding to the 8 mm focal lenth, the vignetting would be reduced to a value below 2 EV.
By f/4.0 brightness loss in frame corners amounts to 47% (-1.83 EV), by f/5.6 it is decreased to 38% (-1.39 EV), and by f/8.0 you see it reduced to 37% (-1.32 EV). Further stopping down doesn't provide any measurable effects.
| Fujifilm X-T2, RAW, f/3.5 |
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