Viltrox AF 15 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 is very sensible but it's also strange. At the maximum relative aperture vignetting reaches 29% (−1.00 EV), a really moderate result for f/1.7 aperture, offered by the tested lens. By f/2.0 this aberration decreases just slightly to 28% (-0.95 EV), and by f/2.8 it doesn't change its value completely, still amounting to 28%. By f/4.0 you notice a slight decrease once again, this time to 25% (-0.85 EV), and then you get a surprise because further stopping down of the aperture doesn't provide any measureable effects.
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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 59% (−2.59 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 and is rather fast aperture-wise.
By f/2.0 vignetting decreases to 55% (−2.32 EV), and by f/2.8 to 42% (−1.57 EV). By f/4.0 you have to take into account a loss of light reaching 37% (−1.34 EV), and by f/5.6 it's a value of 35% (-1.27 EV). Further stopping down of the aperture doesn't have any measureable effect on this aberration.
| Fujifilm X-T2, RAW, f/1.7 |
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