Sigma C 23 mm f/1.4 DC DN
8. Vignetting
Much more interesting things can be gleaned from the RAW files analysis. We present thumbnails of such photos below.
| X-T2, RAW, f/1.4 | X-T2, RAW, f/2.0 |
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| X-T2, RAW, f/2.8 | X-T2, RAW, f/4.0 |
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At the maximum relative aperture vignetting amounts to 46% (-1.81 EV). It is not an especially low level but, in case of mirrorless tests of fast, wide angle lens, any result below 50% should be considered acceptable. We think the Sigma shouldn't be criticized here, especially as it fares better than its direct rivals.
It's worth mentioning that vignetting can be quite efficiently reduced by stopping down the aperture. By f/2.0 you deal with a value of 30% (-1.05 EV), by f/2.8 it's a level of 17% (-0.54 EV), and by f/4.0 this aberration decreases additionally to 14% (-0.45 EV). Further stopping down of aperture doesn't produce any measureable effects.
| Fujifilm X-T2, RAW, f/1.4 |
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