Tamron 70-180 mm f/2.8 Di III VC VXD G2
8. Vignetting
| A7R IIIa, APS-C, 70 mm, f/2.8 | A7R IIIa, APS-C, 70 mm, f/4.0 |
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| A7R IIIa, APS-C, 125 mm, f/2.8 | A7R IIIa, APS-C, 125 mm, f/4.0 |
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| A7R IIIa, APS-C, 180 mm, f/2.8 | A7R IIIa, APS-C, 180 mm, f/4.0 |
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In this case there are no problems at any focal length. If you apply the widest angle of view available and the f/2.8 aperture you have to take into account the loss of just 16% (−0.51 EV) of light in frame corners. The problem disappears practically completely by f/4.0, where vignetting reaches just 4% (−0.13 EV).
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The middle of the focal range is a bit weaker. By f/2.8 and f/4.0 we got the following results: 21% (−0.69 EV), and 5% (−0.16 EV) respectively. By f/5.6 vignetting decreases even more, this time to a negligible value of 3% (-0.10 EV).
At the maximum focal length and maximum relative aperture vignetting amounts to 29% (−0.53 EV) and decreases to an imperceptible level of 10% (−0.31 EV) on stopping down the aperture to f/4.0 and to just 3% (-0.10 EV) on stopping down to f/5.6.
Let's check how the tested lens deal with this aberration on full frame – appropriate photos can be found below.
| A7R IIIa, FF, 70 mm, f/2.8 | A7R IIIa, FF, 70 mm, f/4.0 |
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| A7R IIIa, FF, 125 mm, f/2.8 | A7R IIIa, FF, 125 mm, f/4.0 |
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| A7R IIIa, FF, 180 mm, f/2.8 | A7R IIIa, FF, 180 mm, f/4.0 |
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At the combination of the 70 mm focal length and f/2.8 aperture problems are clearly visible, with vignetting reaching 49% (−1.97 EV). By f/4.0 vignetting decreases to 29% (−1.01 EV), and by f/5.6 it drops further to 13% (−0.42 EV), and by f/8.0 to 9% (−0.26 EV). Further stopping down doesn't produce any measurable effects.
In the middle of the focal range you can notice a slight worsening of the performance. By f/2.8 brightness loss in frame corners amounts to 59% (−2.56 EV) and it decreases to 37% (−1.35 EV) on stopping down the aperture to f/4.0. By f/5.6 and f/8.0 apertures we got the following results: 21% (−0.68 EV) and 13% (−0.41EV) respectively. This aberration becomes completely imperceptible only by f/11.0, where it reaches 9% (-0.28 EV).
At 180 mm focal length we see similar results to the ones in the middle of the range: at the maximum relative aperture vignetting amounts to 57% (−2.45 EV), by f/4.0 it drops to 37% (−1.34 EV), and by f/5.6 it decreases to 19% (−0.62 EV). By f/8.0 and f/11.0 we got the following results: 11% (−0.35 EV) and 8% (−0.25 EV) respectively.
In this category the Tamron performed weaker than the more expensive Sony model which, at the maximum relative aperture, showed vignetting from 42 to 46% and it depended weakly on the focal length you used.
| Sony A7R IIIa, 70 mm, f/2.8 |
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| Sony A7R IIIa, 125 mm, f/2.8 |
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| Sony A7R IIIa, 180 mm, f/2.8 |
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