Voigtlander Apo Lanthar 35 mm f/2 Aspherical
8. Vignetting
| A7R II, APS-C, f/2.0 | A7R II, APS-C, f/2.8 |
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In this case you get some chances to notice vignetting only at the maximum relative aperture, where its value amounts to 32% (−1.13 EV). By f/2.8 it decreases to 13% (−0.41 EV), and by f/4.0 it is 12% (−0.37 EV).
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After passing to the bigger, full frame sensor there are far more problems and they are clearly visible in the following photos.
| A7R II, FF, f/2.0 | A7R II, FF, f/2.8 |
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| A7R II, FF, f/4.0 | A7R II, FF, f/5.6 |
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At the maximum relative aperture vignetting reaches a huge level of 65% (−3.05 EV) and it is the first serious stlip-up of the tested lens. As a kind of consolation you might add that the Sigma C 2/35 fared even weaker but the Battis had a better result of 55%. What's curious, a bit faster Sony FE 1.8/35, when stopped down to f/2.0, showed a level of 66% so, in fact, the same as the Voigtlander at its maximum relative aperture. The Samyang 1.8/35 doesn't fare better as its vignetting by f/2.0 amounts to 63%. As you can see, in this category the performance of all lenses is similarly weak.
Still it is a bit consoling that, at least at the very beginning, on stopping down the aperture the Voigtlander manages to improve its performance quite quickly. By f/2.8 vignetting amounts to 47% (−1.83 EV), by f/4.0 it decreases to 32% (−1.12 EV), and by f/5.6 to 30% (−1.02 EV). Further stopping down doesn't have any measureable effect on the aberration, described here.
| Sony A7R III, JPEG, f/2.0 |
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