Sigma C 24 mm f/2 DG DN
8. Vignetting
| A7R II, APS-C, f/2.0 | A7R II, APS-C, f/2.8 |
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In this case you get some chances to notice vignetting only at the maximum relative aperture were it amounts to 24% (−0.80 EV). By f/2.8 it decreases to 12% (−0.36 EV), and by f/4.0 it is 11% (−0.34 EV).
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Of course after passing to full frame there are far more problems and photos, shown below, prove that much.
| A7R II, FF, f/2.0 | A7R II, FF, f/2.8 |
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| A7R II, FF, f/4.0 | A7R II, FF, f/5.6 |
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At the maximum relative aperture vignetting reaches a huge level of 69% (−3.36 EV) – moderate physical dimensions of the lens make themselves felt. When you stop down the aperture to f/2.8 the aberration, described here, decreases to a still very high level of 55% (−2.28 EV). Even by f/4.0 and f/5.6 vignetting levels are easy to spot, as our measurements showed, respectively, 38% (−1.40 EV), and 32% (−1.14 EV). As if it wasn't enough, further stopping down of the aperture didn't have any measureable effect on light fall-off.
| Sony A7R III, JPEG, f/2.0 |
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