Voigtlander Apo Lanthar 28 mm f/2 Aspherical
8. Vignetting
| A7R IIIa, APS-C, f/2.0 | A7R IIIa, APS-C, f/2.8 |
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At the maximum relative aperture, vignetting can be noticed, reaching 32% (-1.10 EV). All problems end by f/2.8 and f/4.0, where we got, respectively, 15% (-0.47 EV) and 13% (-0.39 EV).
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After passing to the bigger, full frame sensor, there are far more problems and photos below emphasize it very well.
| A7R IIIa, FF, f/2.0 | A7R IIIa, FF, f/2.8 |
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| A7R IIIa, FF, f/4.0 | A7R IIIa, FF, f/5.6 |
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At the maximum relative aperture, we got a huge result, amounting to 68% (-3.27 EV). By f/2.8 this aberration still reaches a very high level of 52% (-2.11 EV); by f/4.0 it decreases to 37% (-1.34 EV); by f/5.6 it is 35% (-1.23 EV), and by f/8.0 it drops to 33% (-1.18 EV). Further stopping down doesn't provide any measureable effects.
Vignetting is one of the few categories where the Apo Lanthar officially performs weaker than the Sony FE 28 mm f/2 as in its case vignetting by f/2.0 amounted to 67%. Still, 1 percentage point of difference is within our limits of measurement error, so to be honest, you should say that in this category both lenses fare similarly.
| Sony A7R IIIa, JPEG, f/2.0 |
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