Sony FE 50 mm f/1.2 GM
8. Vignetting
| A7R III, APS-C, f/1.2 | A7R III, APS-C, f/1.4 |
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At the maximum relative aperture you can notice vignetting without a problem as it reaches 28% (−0.97 EV) but it can't be called especially high. On a slight stopping down, by f/1.4, the level of this aberration drops to 18% (−0.56 EV). The problems end completely by f/2.0 as vignetting decreases to an imperceptible value of 9% (−0.28 EV).
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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 III, FF, f/1.2 | A7R III, FF, f/1.4 |
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| A7R III, FF, f/2.0 | A7R III, FF, f/2.8 |
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At the maximum relative aperture the loss of light is really huge, reaching as much as 63% (−2.89 EV). Still I have to admit that, taking the dimensions of the lens and its excellent aperture into account, I expected vignetting higher than 3 EV. The fact that our measurements produced a value below that level I consider a pleasant surpirse. It's enough you remind yourself of a performance of the Voigtlander Nokton 50 mm f/1.2, which vignetting amounted to 71%.
Brightness loss in the frame corners decreases noticeably by f/1.4 where it reaches 56% (−2.35 EV). By f/2.0 we got 37% (−1.31 EV), and by f/2.8 the result was 30% (−1.03 EV). By f/4.0 vignetting was just a tad better, getting to 29% (−1.00 EV). Further stopping down didn't have any measureable effect on the aberration, described in this chapter.
| Sony A7R III, JPEG, f/1.2 |
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