Sony FE 14 mm f/1.8 GM
8. Vignetting
| A7R III, APS-C, f/1.8 | A7R III, APS-C, f/2.0 |
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So far there are no reasons to worry. At the maximum relative aperture vignetting is noticeable, amounting to 30% (-1.03 EV), but you can hardly call it high. By f/2.0 it decreases to 25% (-0.82 EV), and by f/2.8 it drops to a value of 16% (-0.50 EV). Further stopping down doesn't have any measureable influence on this aberration.
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Taking into account relatively small physical dimensions of the Sony FE 14 mm f/1.8 GM and the parameters it offers we were really curious how it would deal with vignetting on full frame. Thumbnails, presented below, provide a clear answer to that question.
| A7R III, FF, f/1.8 | 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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The correction of vignetting certainly wasn't easy. At the maximum relative aperture brightness loss in frame corners is really high, amounting to 64% (-2.96 EV). To be honest, I am very pleasantly surprised because I expected results distinctly higher than 3 EV. After all even slower 2.8/14 models produced by Canon and Samyang had higher level of vignetting; only the huge Sigma A 1.8/14 fared better in this category.
Stopping down the aperture to f/2.0 decreases vignetting to 60% (-2.65 EV), and employing the f/2.8 aperture reduces it even more, to a level of 45% (-1.71 EV). Further stopping down has a very slight influence on the aberration, described here, because by f/4.0 it is 43% (-1.63 EV) and remains on the same level also on more significant stopping down.
| Sony A7R III, JPEG, f/1.8 |
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