Viltrox AF 25 mm f/1.7 Air
8. Vignetting
| X-T2, JPEG, f/1.7 | X-T2, RAW, f/1.7 |
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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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| X-T2, JPEG, f/4.0 | X-T2, RAW, f/4.0 |
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In case of JPEG files the situation looks very sensible indeed. At the maximum relative aperture vignetting reaches 26% (−0.88 EV), a really moderate result for the f/1.7 aperture, offered by the tested lens. By f/2.0 this aberration decreases to 20% (-0.66 EV), and by f/2.8 it amounts to 12% (-0.36 EV). By f/4.0 all problems end completely because our result in that place amounts to just 6% (-0.18 EV).
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Still Fujifilm bodies are known for correcting JPEG files without asking for permission even if you attach to them third-party lenses. Only uncorrected and uncropped RAW files are able to show you the real level of this aberration. Here the results are noticeably higher – at the maximum relative aperture you have to take into account light fall-off reaching 52% (−2.12 EV). It is a high value but still you have to remember that you deal here with a relatively small lens that additionally provides a significantly wide angle of view.
By f/2.0 vignetting decreases to 47% (−1.82 EV), and by f/2.8 to 30% (−1.04 EV). By f/4.0 you have to tolerate a loss reaching 22% (−0.60 EV), and by f/5.6 the light fall-off amounts to 20% (-0.65 EV). Further stopping down doesn't have any measureable effect on this aberration.
| Fujifilm X-T2, RAW, f/1.7 |
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