Sony FE 85 mm f/1.4 GM
8. Vignetting
| A7R II, APS-C, f/1.4 | A7R II, APS-C, f/2.0 |
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The significant physical dimensions of the lens allow it to get good results in this category. The vignetting is visible only at the maximum relative aperture where it reaches 23% (−0.75 EV). By f/2.0 and f/2.8 it disappears practically completely, amounting to, respectively, 7% (−0.20 EV) and 2% (−0.07 EV).
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When you use the bigger full frame sensor there are far more problems and the photos below show them very clearly.
| A7R II, FF, f/1.4 | 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 the brightness loss in the frame corners is 54% (−2.24 EV). It is a high value but still it remains lower than the result of the huge Otus 1.4/85; it is also noticeably better than the result reached by the Milvus 1.4/85. On the other hand the Sigma 1.4/85 HSM had vignetting of just 37%.
In the case of the Sony FE 1.4/85 GM the stopping down is less effective than in the case of its rivals. By f/2.0 the vignetting is 36% (−1.27 EV), and by f/2.8 it remains still 30% (−1.05 EV). The vignetting of the Otus at that point was just 15% and that of the Milvus reached 24%.
The brightness loss is still visible by f/4.0 and f/5.6 where it amounts to, respectively, 26% (−0.87 EV) and 21% (−0.67 EV). Almost imperceptible level of that aberration can be achieved only by f/8 and f/11, where we got the following results: 15% (−0.47 EV) and 10% (−0.29 EV).
Below we present the averaged out values of brightness loss in concentric circles you get as you move away from the frame centre. The percentage numbers, presented in every picture, state the size of the real surface area limited from above and from the right with a value of 100% and from below by the presented curve. That’s how you know how much light overall is lost due to the vignetting. Still you shouldn’t mix up those percentage values with the ones, given at the beginning of the chapter because they are not directly connected with each other.
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