Sony FE 24-105 mm f/4 G OSS
8. Vignetting
| A7R III, APS-C, JPEG, 24 mm, f/4.0 | A7R III, APS-C, JPEG, 24 mm, f/5.6 |
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| A7R III, APS-C, JPEG, 40 mm, f/4.0 | A7R III, APS-C, JPEG, 40 mm, f/5.6 |
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| A7R III, APS-C, JPEG, 70 mm, f/4.0 | A7R III, APS-C, JPEG, 70 mm, f/5.6 |
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| A7R III, APS-C, JPEG, 105 mm, f/4.0 | A7R III, APS-C, JPEG, 105 mm, f/5.6 |
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In this case you won't encounter any problems practically at any focal length. At 24 mm and by f/4.0 vignetting is just 9% (−0.26 EV) and it decreases by another percentage point when you stop the aperture down.
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At the 40 mm focal length and at the maximum relative aperture brightness loss in frame corners reaches 10% (−0.29 EV) and it decreases to 6% (−0.19 EV), when you stop the aperture down to f/5.6. A very similar situation can be observed at 70 mm, where, by f/4.0, vignetting is 10% (−0.31 EV) and decreases to 5% (−0.15 EV) after employing the f/5.6 aperture.
At the maximum focal length vignetting is at its highest, because by f/4.0 it reaches 11% (−0.39 EV), but even there it would be difficult to notice it. Especially that by f/5.6 it decreases to just 4% (−0.11 EV).
The performance on RAW files is only slightly weaker and small wonder; distortion on the detector of the size of the APS-C sensor is moderate so there is not much to be corrected and cropped afterwards. Vignetting on RAW files is by 1-2% higher than on JPEGs - a difference within the margin of measuring error.
Now let's check the situation on full frame. Our analysis we start with JPEG files and appropriate thumbnails can be found below.
| A7R III, FF, JPEG, 24 mm, f/4.0 | A7R III, FF, JPEG, 24 mm, f/5.6 |
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| A7R III, FF, JPEG, 40 mm, f/4.0 | A7R III, FF, JPEG, 40 mm, f/5.6 |
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| A7R III, FF, JPEG, 70 mm, f/4.0 | A7R III, FF, JPEG, 70 mm, f/5.6 |
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| A7R III, FF, JPEG, 105 mm, f/4.0 | A7R III, FF, JPEG, 105 mm, f/5.6 |
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At the difficult combination of the widest angle and the maximum aperture losses of light in the frame corners reach 59% (−2.58 EV). It's a lot but not unheard-of in mirrorless lenses. Stopping down the aperture hepls a bit but is not especially efficient. By f/5.6 vignetting is 45% (−1.74 EV), by f/8.0 it reaches 32% (−1.12 EV), and by f/11.0 it approaches 27% (−0.91 EV). Even by f/16.0 you still get a chance to notice it with a result of 25% (−0.83 EV).
A noticeably better situation can be observed at the 40 mm focal length where, at the maximum relative aperture, vignetting amounts to 32% (−1.10EV); it decreases to 23% (−0.76 EV) on stopping down the aperture to f/5.6. By f/8.0 it reaches 17% (−0.55 EV), and further stopping down is able to reduce this aberration by another 1% at the most.
At 70 mm you see a deterioration of the performance because by f/4.0 vignetting reaches 44% (−1.67 EV), and by f/5.6 it gets to 27% (−0.89 EV). By f/8.0 and f/11.0 you get respectively the following results: 14% (−0.44 EV) and 12% (−0.38 EV). Further stopping down doesn't bring any measureable effects.
After passing to the 105 mm focal length the situation doesn't change in a meaningful way. At the maximum relative aperture the result is 45% (−1.72 EV), and by f/5.6 you see a value of 26% (−0.88 EV). By f/8.0 vignetting is reduced to 12% (−0.38 EV), and by f/11.0 it becomes completely imperceptible, dropping to 9% (−0.27 EV).
Finally let's check the situation for uncorrected RAW files – appropriate thumbnails you can find below.
| A7R III, FF, RAW, 24 mm, f/4.0 | A7R III, FF, RAW, 24 mm, f/5.6 |
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| A7R III, FF, RAW, 40 mm, f/4.0 | A7R III, FF, RAW, 40 mm, f/5.6 |
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| A7R III, FF, RAW, 70 mm, f/4.0 | A7R III, FF, RAW, 70 mm, f/5.6 |
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| A7R III, FF, RAW, 105 mm, f/4.0 | A7R III, FF, RAW, 105 mm, f/5.6 |
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When compared to JPEG files there are some differences but only at the shortest focal length. In the 40-105 mm range distortion and vignetting gradient are lower so RAW files show results by just 1-3% higher than on JPEGs.
In case of 24 mm focal length on RAW files the lens basically performs on the border of its image circle and that's why by f/4.0 vignetting reaches a huge level of 76% (−4.81EV). Stopping down the aperture helps very little – by f/5.6 that value decreases to 70% (−4.06 EV), and by f/8.0 to 62% (−3.24 EV). Even by f/11.0 you won't have any problems with noticing vignetting as it amounts to a high value of 55% (−2.73 EV).
| Sony A7R III, 24 mm, JPEG, f/4.0 |
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| Sony A7R III, 40 mm, JPEG, f/4.0 |
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| Sony A7R III, 70 mm, JPEG, f/4.0 |
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| Sony A7R III, 105 mm, JPEG, f/4.0 |
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