Sigma A 35 mm f/1.4 DG II
8. 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 distinct, reaching a not bothersome value of 31% (-1.06 EV). The problem disappears practically completely by f/2.0 and f/2.8 where we got, respectively, 14% (-0.42 EV), and 10% (-0.29 EV).
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After passing to the bigger, full frame sensor, there are far more problems and 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 very high, reaching 65% (−3.02 EV). It is a result very similar to the one of the Samyang (65%), and Sony (66%), being, at the same time, a bit weaker than 58% shown by the Nikkor.
By f/2.0 you deal with a still distinct vignetting level of 46% (-1.76 EV) which decreases to a value of 35% (-1.25 EV) on stopping down the aperture to f/2.8. Moderate values can be observed up from f/4.0 where we got 28% (-0.93 EV). What's interesting, further stopping down doesn't have any measureable effect on this aberration.
| Sony A7R IIIa, JPEG, f/1.4 |
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