Samyang AF 24-70 mm f/2.8 FE
8. Vignetting
| A7R III, APS-C, 24 mm, f/2.8 | A7R III, APS-C, 24 mm, f/4.0 |
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| A7R III, APS-C, 45 mm, f/2.8 | A7R III, APS-C, 45 mm, f/4.0 |
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| A7R III, APS-C, 70 mm, f/2.8 | A7R III, APS-C, 70 mm, f/4.0 |
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In this case there are no problems at any focal length. When you apply the widest available angle of view and the f/2.8 aperture you have to take into account a loss of just 13% (−0.42 EV) of light in frame corners. The problem disappears practically completely by f/4.0, where it reaches only 10% (−0.31 EV).
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In the middle of the focal range the situation is even better because by f/2.8 and f/4.0 we got, respectively, 8% (−0.25 EV) and 6% (−0.18 EV).
At the maximum focal length and the maximum relative aperture vignetting amounts to12% (−0.36 EV) and it decreases to an imperceptible level of 5% (−0.16 EV) on stopping down the aperture to f/4.0.
Now let's check the performance of the tested lens on full frame – appropriate photos you can find below.
| A7R III, FF, 24 mm, f/2.8 | A7R III, FF, 24 mm, f/4.0 |
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| A7R III, FF, 45 mm, f/2.8 | A7R III, FF, 45 mm, f/4.0 |
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| A7R III, FF, 70 mm, f/2.8 | A7R III, FF, 70 mm, f/4.0 |
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Here the big Samyang, with less optical elements inside, demonstrated its distinc superiority over the Sigma. Let's remind here that, at the most difficult combination of wide angle of view and the maximum relative aperture the Sigma lost in the frame corners as much as 74% of light. The Samyang performs much better; in its case the loss reaches 53% (-2.21 EV) and it decreases to 46% (−1.79 EV) on stopping down the aperture to f/4.0 and to 42% (−1.58 EV) after applying the f/5.6 aperture. By f/8.0, f/11.0, and f/16.0 we got, respectively: 39% (−1.43 EV), 35% (−1.26 EV) and 32% (−1.11 EV).
The situation gets better in the middle of the focal range. By f/2.8 vignetting amounts to 40% (−1.49 EV) and it decreases to 28% (−0.96 EV) on stopping down the lens by 1 EV. By f/5.6 we got a result of 19% (−0.62 EV); by f/8.0 and f/11.0 the level of this aberration remains the same, reaching 15% (−0.48 EV).
A slight increase of vignetting you can notice at the maximum focal length. In its case, by f/2.8, brightness loss in the frame corners gets to 46% (−1.80 EV), and by f/4.0 it drops to 33% (−1.15 EV). All problems by and large end by f/5.6 and f/8.0, where we got the following results: 19% (−0.61 EV), and 11% (−0.34 EV) respectively.
| Sony A7R III, 24 mm, f/2.8 |
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| Sony A7R III, 45 mm, f/2.8 |
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| Sony A7R III, 70 mm, f/2.8 |
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