Viltrox AF 13 mm f/1.4 XF
8. Vignetting
| X-T2, JPEG, f/1.4 | X-T2, RAW, f/1.4 |
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| X-T2, JPEG, f/2.0 | X-T2, RAW, f/2.0 |
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| X-T2, JPEG, f/2.8 | X-T2, RAW, f/2.8 |
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In case of JPEG files the situation is quite good – at the maximum relative aperture vignetting amounts to 37% (-1.35 EV), a very sensible result for such parameters difficult to correct. Still it is interesting that this aberration decreases so slowly with stopping down. By f/2.0 the result is 34% (-1.21 EV), by f/2.8 it decreases to 28% (-0.96 EV), and by f/4.0 it reaches 24% (-0.81 EV). Further stopping down doesn't produce any measurable effects.
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Uncorrected RAW files are able to say us more about the real level of this aberration. Here the results are higher because at the maximum relative aperture you have to take into account the light loss in the frame corners of 55% (-2.32 EV). It's a lot but still you have to remember what parameters we are dealing with. By f/2.0 vignetting decreases to 43% (-1.63 EV), and by f/2.8 to 34% (-1.21 EV). By f/4.0 you have to make do with a loss of 30% (-1.04 EV), and that value changes marginally because just to 29% (-1.00 EV) after another stopping down of the aperture by 1 EV.
| Fujifilm X-T2, RAW, f/1.4 |
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