Samyang AF 50 mm f/1.4 FE II
8. Vignetting
| A7R III, APS-C, f/1.4 | A7R III, APS-C, f/2.0 |
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No reasons to complain in this case – even at the maximum relative aperture vignetting reaches a moderate level of 24% (−0.81 EV). All problems end by and large by f/2.0 and f/2.8 where we got the following values: 10% (−0.30 EV) and 7% (−0.22 EV) respectively.
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After passing to the bigger full frame sensor there are far more problems and photos below are the proof.
| A7R III, FF, f/1.4 | A7R III, FF, f/2.0 |
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| A7R III, FF, f/2.8 | A7R III, FF, f/4.0 |
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At the maximum relative aperture the vignetting result is very high, reaching 60% (−2.63 EV). Of course you should remember that the Sigma A 50 mm f/1.4 DG DN showed here a noticeably higher value, that of 67%. On the other hand, the predecessor of the tested lens fared here better, with a result of just 50%.
Stopping down the aperture to f/2.0 decreases vignetting to 45% (−1.73 EV), and by f/2.8 this aberration reaches 28% (−0.97 EV). You can talk about a moderate level only by f/4.0 and f/5.6, where we got, respectively, 21% (−0.67 EV) and 18% (−0.56 EV). Further stopping down doesn't provide any measureable effects.
| Sony A7R III, JPEG, f/1.4 |
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