Tamron SP 45 mm f/1.8 Di VC USD
8. Vignetting
| Nikon D7000, f/1.8 | Nikon D7000, f/2.0 |
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Even without precise numbers it is clear there are no problems almost at all. At the maximum relative aperture the vignetting level reaches just 17% (−0.53 EV) and then it decreases to 12% (−0.38 EV) on stopping down the aperture to f/2.0. By f/2.8 there is practically no vignetting as its level reaches just 4% (−0.13 EV).
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During the launch of two new Tamrons there were declarations that even on full frame the vignetting would be low. It’s time for the reality check.
| Nikon D3x, f/1.8 | Nikon D3x, f/2.0 |
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| Nikon D3x, f/2.8 | Nikon D3x, f/4.0 |
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At the maximum relative aperture the vignetting can be noticed without any problems, reaching 37% (−1.32 EV). Is that level high? The results of its rivals might answer that question. By the same aperture value the Canon 1.8/50 STM got a result of 61%, and the Nikkor 1.8/50G 44%. As you see, the Tamron fares much better here.
When you stop down the aperture to f/2.0, the vignetting decreases to 32% (−1.10 EV). The aberration becomes low already by f/2.8 where it is just 17% (−0.54 EV) and it is practically imperceptible by f/4.0 (10% and −0.31 EV).
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