Sigma A 30 mm f/1.4 DC HSM
8. Vignetting
At the maximum relative aperture the light fall-off amounts to 32% (-1.10 EV). It is a visible level but nothing especially worrisome. After stopping down the lens to f/20 the vignetting decreases to 15% (-0.47 EV). The aberration vanishes completely by f/2.8, reaching just 6% (-0.18 EV).
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The chart below shows how these results compare to the performance of the predecessor of the tested lens as well as those of its rivals.
| |
Sigma A 1.4/30 |
Sigma 1.4/30 |
Nikkor AF-S 1.8/35 |
Sony 1.8/35 |
Pentax 2.4/35 |
| f/1.4–1.8 |
32% |
35% |
37% |
44% |
− |
| f/2.0 |
15% |
30% |
31% |
39% |
− |
| f/2.8 |
6% |
24% |
22% |
14% |
25% |
As you can notice the new Sigma simply outclass its competitors and the older version as well. Already at the maximum relative aperture (which is, after all, the brightest) it gains the upper hand. On stopping down that advantage even increases. In this category the tested Sigma A 30 mm f/1.4 DC HSM definitely deserves our praise.
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