Sirui Aurora 35 mm f/1.4
9. Vignetting
| A7R IIIa, APS-C, f/1.4 | A7R IIIa, APS-C, f/2.0 |
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Even at the maximum relative aperture, vignetting is not especially bothersome, reaching a value of 27% (-0.89 EV). The problem disappears completely by f/2.0 where we got a result of just 8% (-0.25 EV).
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After switching to the bigger, full frame sensor, there are far more problems and the photos below show them pretty well.
| A7R IIIa, FF, f/1.4 | A7R IIIa, FF, f/2.0 |
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| A7R IIIa, FF, f/2.8 | A7R IIIa, FF, f/4.0 |
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At the maximum relative aperture, the lens's result is high, reaching 59% (−2.59 EV). It is a result very similar to the one of the Nikkor (58%) and both these lenses fare better than the rest of the rivals as their results exceed 60%.
By f/2.0 aperture, you deal with a level of 33% (-1.15 EV), that decreases to a value of 28% (-0.97 EV) on stopping down the aperture to f/2.8. What's interesting further stopping down doesn't have any measurable influence on this aberration.
| Sony A7R IIIa, JPEG, f/1.4 |
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