Sigma C 24 mm f/3.5 DG DN
8. Vignetting
| A7R II, APS-C, f/3.5 | A7R II, APS-C, f/5.6 |
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The smaller sensor doesn't give you any reasons to worry. At the maximum relative aperture vignetting reaches 29% (−1.00 EV) and it decreases to 25% (−0.83 EV) on slight stopping down the aperture to f/4.0. By f/5.6 you can observe further decrease, this time to 17% (−0.54 EV), and after passing to f/8.0 you don't see any difference, with vignetting reaching 16% (−0.51 EV).
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The parameters of the tested lens are quite untypical so we were very curious how it would perform on full frame in this category.
| A7R II, FF, f/3.5 | A7R II, FF, f/4.0 |
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| A7R II, FF, f/5.6 | A7R II, FF, f/8.0 |
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There is a lot of problems. Light fall-off in the corners of the frame amounts to as much as 70% (−3.46 EV). It is a huge value, but you should mention the fact that the rival Samyang 2.8/24 fared even worse. Still, the Sony and the Tamron managed to perform better. On stopping down the aperture to f/4.0 you see vignetting decrease to 65% (−3.07 EV), and after employing f/5.6 relative aperture it drops to 61% (−2.76 EV). Further stopping down causes a consistent but slow decrease of vignetting values. By f/8.0, f/11.0, and f/16.0 we got the following results: 57% (−2.47 EV), 53% (−2.19 EV), and 48% (−1.90 EV) respectively. Even changing the aperture from f/16.0 to f/22.0 allows you to decrease vignetting by several percent, to 43% (−1.64 EV).
| Sony A7R III, JPEG, f/3.5 |
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