Viltrox AF 35 mm f/1.2 LAB
8. Vignetting
| A7R IIIa, APS-C, f/1.2 | A7R IIIa, APS-C, f/1.4 |
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Even at the maximum relative aperture, vignetting is not especially bothersome, with a value of 28% (-0.94 EV). The change of aperture into f/1.4 decreases this aberration to 17% (-0.53) and by f/2.0 it becomes almost completely imperceptible, dropping to 10% (-0.30 EV).
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After passing to the bigger full frame sensor there are noticeably more problems, and the photos below show them pretty well.
| A7R IIIa, FF, f/1.2 | A7R IIIa, FF, f/1.4 |
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| A7R IIIa, FF, f/2.0 | A7R IIIa, FF, f/2.8 |
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At the maximum relative aperture, the result is high and reaches 64% (−2.92 EV). Still, when compared to the 73% shown by the older Sigma A 35 mm f/1.2 DG DN, you might consider it rather reasonable.
By f/1.4 this aberration reaches 57% (-2.46 EV), by f/2.0 it decreases to 41% (-1.52 EV), and by f/2.8 it amounts to 36% (-1.28 EV). Some issues can still be noticed by f/4.0, where we determined a level of 29% (-1.01 EV). Further stopping down doesn't provide any measurable effects whatsoever.
| Sony A7R IIIa, JPEG, f/1.2 |
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