Tokina ATX-M 33 mm f/1.4 X
8. Vignetting
| X-T30, JPEG, f/1.4 | X-T30, RAW, f/1.4 |
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| X-T30, JPEG, f/2.0 | X-T30, RAW, f/2.0 |
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| X-T30, JPEG, f/2.8 | X-T30, RAW, f/2.8 |
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It's clear that vignetting is automatically corrected in JPEG files and this process cannot be switched off. As a result vignetting values are moderate, even low. By f/1.4 brightness loss in frame corners amounts to 25% (−0.83 EV) and it decreases to 16% (−0.51 EV) on stopping down the aperture to f/2.0. By f/2.8 the aberration drops to 10% (−0.30 EV), and by f/4.0 to 7% (−0.21 EV), becoming practically invisible.
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The real situation can be observed only by consulting RAW files. At the maximum relative aperture vignetting amounts to 46% (−1.76 EV). It is a significant value but, if you take the aperture fastness and the angle of view of the tested lens into account you can call this result still acceptable. Especially that the rival Fujinon 1.4/33 had a very similar vignetting level, that of 47%.
The Tokina fares better on more distinct stopping down as then vignetting decreases faster. By f/2.0 you see a moderate level of 25% (−0.82 EV), by f/2.8 the aberration stops being a nuisance, reaching just 14% (−0.44 EV), and by f/4.0 it decreases even futher to 12% (−0.36 EV).
| Fujifilm X-T30, JPEG, f/1.4 |
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| Fujifilm X-T30, RAW, f/1.4 |
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