Voigtlander Apo Lanthar 50 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 29% (−0.98 EV). By f/2.8 and f/4.0 it pecomes practically imperceptible, decreasing to, respectively, 10% (−0.32 EV), and 9% (−0.26 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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The Voigtlander Apo Lanthar 2/50 is a lens relatively small and narrow so we expected a high level of vignetting on full frame. Our estimations proved to be right: at the maximum relative aperture brightness loss in frame corners reaches as much as 59% (−2.61EV), by f/2.8 it still remains siginficant, amounting to 40% (−1.46 EV) and only from f/4.0 you can talk about a moderate level, with light fall-off decreasing to 26% (−0.85 EV). By f/5.6 it decreases even further, to 23% (−0.74 EV), and then it stops reacting on further stopping down.
| Sony A7R III, JPEG, f/2.0 |
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