Sony FE 70-200 mm f/4 Macro G OSS II
8. Vignetting
| 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, 135 mm, f/4.0 | A7R III, APS-C, JPEG, 135 mm, f/5.6 |
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| A7R III, APS-C, JPEG, 200 mm, f/4.0 | A7R III, APS-C, JPEG, 200 mm, f/5.6 |
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In case of the smaller detector there are almost no problems with vignetting at all. At the 70 mm focal length and the maximum relative aperture brightness loss in the frame corners reaches just 15% (-0.47 EV) and decreases to an imperceptible level of 5% (-0.15 EV) on stopping down the aperture to f/5.6.
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In the middle of the focal range is even better because at the maximum relative aperture vignetting reaches 13% (-0.40 EV), and by f/5.6 it is just only 4% (-0.11 EV).
A slight increase of the aberration, described here, can be noticed at the maximum focal length where, by f/4.0, you deal with a level of 22% (-0.70 EV), which very quickly decreases on stopping down, and by f/5.6 it is just 5% (-0.15 EV).
Now let's check how the situation changes after passing to full frame – appropriate thumbnails are presented below.
| 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, 135 mm, f/4.0 | A7R III, FF, JPEG, 135 mm, f/5.6 |
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| A7R III, FF, JPEG, 200 mm, f/2.8 | A7R III, FF, JPEG, 200 mm, f/4.0 |
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This time the aberration, described in this part of our test, is much easier to notice but, of course, for mirrorless systems standards you can hardly complain. At 70 mm and by f/4.0 light fall-off in the corners amounts to 47% (−1.86 EV), and it decreases to 28% (−0.95 EV) on stopping down the aperture to f/5.6. All problems end by f/8.0, and f/11.0, where our measurements were, respectively: 13% (−0.41 EV) and 11% (−0.34 EV).
After changing the focal length to 135 mm the results are noticeably better. By f/4.0 vignetting is 34% (−1.18 EV), by f/5.6 it reaches 16% (−0.51 EV), and by f/8.0 it drops to an imperceptible level of 9% (−0.28 EV).
A bit higher results you see at the maximum focal length. If you employ the f/4.0 aperture then brightness loss in the frame corners will reach 47% (−1.84 EV); after passing to f/5.6 the aberration decreases to a level of 28% (−0.94 EV). By f/8.0 and f/11.0 we got also the following results: 15% (−0.46 EV), and 9% (−0.26 EV).
It's worth mentioning the fact that in case of both detectors we analized the performance for JPEG files, already distortion-corrected and slightly cropped. As distortion is not especially high here, that cropping doesn't matter a lot. However, if you analize vignetting for RAW files, its levels will be higher. In case of the APS-C sensor typically you have to add 1-2% to the results above; in case of full frame this correction should jump to 2-3%.
| Sony A7R III, 70 mm, JPEG, f/4.0 |
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| Sony A7R III, 135 mm, JPEG, f/4.0 |
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| Sony A7R III, 200 mm, JPEG, f/4.0 |
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