Sony FE 35 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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At the maximum relative aperture you can notice vignetting without a problem as it reaches 32% (−1.12 EV). These problems end by f/2.0 as the level of this aberration drops to 17% (−0.56 EV). By f/2.8 it decreases further to 15% (−0.46 EV) and after that point stopping down doesn't have any measureable influence on brightness loss.
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After passing to the bigger, full frame sensor there are much more problems and the photos we present below show them very well.
| 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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The loss of light at the maximum relative aperture is really huge, reaching as much as 66% (−3.08 EV). It remains noticeable also by f/2.0, where it amounts to 50% (−2.00 EV). What's more, further stopping down is not as efficient as you would expect. By f/2.8 the light fall-off in the frame corners is 43% (−1.63 EV), and by f/4.0 it decreases to 37% (−1.34 EV) ; after that point the lens stops reacting on any stopping down. It would be difficult not to complain about such a performance.
| Sony A7R II, JPEG, f/1.4 |
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Below we present averaged out values of brightness loss shown in concentric circles as you move further away from the frame centre. The numerical value for every image, expressed in percents, shows the area limited from the top and right by 100% and from the bottom by the presented curve. The area indicates how much light overall is lost due to the vignetting effect. Please don’t mix these percentages with the values given at the beginning of the chapter because they aren’t directly connected.
