Sony FE 85 mm f/1.8
8. Vignetting
| A7R II, APS-C, f/1.8 | A7R II, APS-C, f/2.0 |
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The light fall-off in the frame corners is noticeable only near the maximum relative aperture, by f/1.8 and f/2.0 amounting to 28% (−0.95 EV) and 23% (−0.75 EV) respectively. By f/2.8 it drops to a negligible level of 9% (−0.27 EV), and by f/4.0 it disappears practically completely (5% and −0.16 EV).
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After passing to a bigger full frame sensor there are much more problems and photos shown below are the proof.
| A7R II, FF, f/1.8 | A7R II, FF, f/2.0 |
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| A7R II, FF, f/2.8 | A7R II, FF, f/4.0 |
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At the maximum relative aperture we got as much as 58% (−2.48 EV) of brightness loss, a value notably higher than 43% of the Nikkor AF-S 1.8/85g and 47% of the Canon EF 1.8/85. Still these problems only were to be expected after the performance of the previous chapter – such heavily truncated circles of light don't come out of nothing.
By f/2.0 the vignetting decreases to 52% (−2.12 EV), still remaining very bothersome. By f/2.8 it drops to 30% (−1.03 EV), and by f/4.0 it gets even lower, to 25% (−0.84 EV). When you stop down the aperture to f/5.6 you are able to limit that aberration to 22% (−0.72 EV), and results by f/8.0 and f/11.0 are, respectively, 18% (−0.57 EV) and 12% (−0.38 EV).
| Sony A7R II, JPEG, f/1.8 |
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