Viltrox AF 55 mm f/1.8 EVO
8. Vignetting
| A7R IIIa, APS-C/DX, f/1.8 | A7R IIIa, APS-C/DX, f/2.0 |
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Even at the maximum relative aperture vignetting isn't something you should worry about, reaching a moderate value of 23% (-0.74 EV). A change of aperture into f/2.0 makes this aberration decrease to 19% (-0.59 EV), and by f/2.8 all problems end completely, with a result of just 6% (-0.18 EV).
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After passing to the full frame sensor there are far more problems and photos below show it nicely.
| A7R IIIa, FF, f/1.8 | 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 our measurements showed a very high vignetting level, reaching 57% (-2.47 EV). Here the majority of the Viltrox's rivals presented themselves better – the Panasonic S 1.8/55 had a level of 44%, the Nikkor Z 1.8/50 showed 53% and the slower Sigma 2/50 lost 56% of light in the corners. Only the Sonnar, with a result of 59% is slightly defeated with the Viltrox. Of course we have to admit that the values presented by the Viltrox, the Sony, the Nikkor, and the Sigma, considering measurements errors, are very similar. Only the Panasonic performs noticeably better.
By f/2.0 this aberration reaches 53% (-2.20 EV), by f/2.8 it drops to 32% (-1.13 EV), and by f/4.0 it amounts to 19% (-0.59 EV). All problems end by f/5.6, where we got a result reaching 13% (-0.40 EV). Further stopping down of the aperture doesn't bring any measureable effects.
| Sony A7R IIIa, JPEG, f/1.8 |
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