Tamron 28-75 mm f/2.8 Di III RXD
8. Vignetting
| A7R II, APS-C, 28 mm, f/2.8 | A7R II, APS-C, 28 mm, f/4.0 |
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| A7R II, APS-C, 50 mm, f/2.8 | A7R II, APS-C, 50 mm, f/4.0 |
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| A7R II, APS-C, 75 mm, f/2.8 | A7R II, APS-C, 75 mm, f/4.0 |
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At the 28 mm focal length the vignetting is difficult to perceive even at the maximum relative aperture as it amounts to 14% (−0.42 EV); then it decreases to 8% (−0.25 EV) on stopping down the aperture to f/4.0.
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At 50 mm the situation is even better – by f/2.8 the vignetting reaches just 12% (−0.37 EV), and by f/4.0 it decreases to a value of 6% (−0.18 EV).
In the case of the APS-C sensor you get the biggest chances to see vignetting at the maximum relative aperture where, by f/2.8, it amounts to 19% (−0.62 EV). The aberration disappears practically completely by f/4.0 where the result, measured by us, amounted to just 6% (−0.19 EV).
Now let's see how the tested lens perform on the full frame detector – below you can find appropriate photos.
| A7R II, FF, 28 mm, f/2.8 | A7R II, FF, 28 mm, f/4.0 |
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| A7R II, FF, 50 mm, f/2.8 | A7R II, FF, 50 mm, f/4.0 |
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| A7R II, FF, 75 mm, f/2.8 | A7R II, FF, 75 mm, f/4.0 |
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At the combination of 28 mm focal length and f/2.8 aperture you can notice very serious problems - the light fall-off amounts to as much as 66% (−3.08 EV). Stopping down the aperture helps to decrease that value but that process is hardly fast: by f/4.0 vignetting is 52% (−2.13 EV), by f/5.6 it reaches 37% (−1.33 EV), by f/8.0 it approaches 25% (−0.84 EV), and by f/11 it finally decreases to a level of 21% (−0.69 EV).
Markedly better performance can be observed at the 50 mm focal length where, at the maximum relative aperture, the vignetting is 38% (−1.40 EV); by f/4.0 it decreases to 23% (−0.76 EV), by f/5.6 it reaches 15% (−0.47 EV), and further stopping down manages to lower it by another 1%.
At the maximum focal length serious vignetting problems return. In that place by f/2.8 that aberration reaches a huge value of 63% (−2.91 EV). By f/4.0 it decreases to 46% (−1.80 EV), by f/5.6 to 29% (−0.98 EV), by f/8.0 it is 21% (−0.70 EV), and by f/11 it amounts to just 15% (−0.48 EV).
We have to say the performance in this category is really weak. It is perhaps a result of a narrow casing of the lens and a short distance dividing the rear element and the sensor. It's enough to remind here that the Tamron SP 24–70 mm f/2.8 VC USD G2, an instrument more difficult to correct in the category of vignetting just because of its wider angle of view with the same aperture fastness, fared distinctly better.
| Sony A7R II, 28 mm, f/2.8 |
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| Sony A7R II, 50 mm, f/2.8 |
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| Sony A7R II, 75 mm, f/2.8 |
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