Tamron 100-400 mm f/4.5-6.3 Di VC USD
8. Vignetting
| Canon 50D, 100 mm, f/4.5 | Canon 50D, 100 mm, f/5.6 |
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| Canon 50D, 200 mm, f/5.6 | Canon 50D, 200 mm, f/8.0 |
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| Canon 50D, 300 mm, f/6.3 | Canon 50D, 300 mm, f/8.0 |
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| Canon 50D, 400 mm, f/6.3 | Canon 50D, 400 mm, f/8.0 |
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At the 100 mm focal length the vignetting level is low even at the maximum relative aperture, reaching just 19% (−0.61 EV). It decreases to 13% (−0.41 EV) on stopping down the aperture to f/5.6 and becomes practically imperceptible (6% and −0.18 EV) by f/8.0.
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Even better situation can be observed at 200 mm where brightness loss in frame corners by f/5.6 is just 16% (−0.51 EV); then it decreases to 6% (−0.18 EV) on stopping down to f/8.0.
Similar results you see at 300 mm. In that case, at the maximum relative aperture, which is f/6.3 at that point, you get a vignetting level of 18% (−0.59 EV); then it decreases to 7% (−0.20 EV), on stopping down the aperture to f/8.0.
The biggest chances to notice vignetting you get at the 400 mm focal length. At the maximum relative aperture its level is 23% (−0.76 EV) and then it drops to 7% (−0.22 EV), an imperceptible value, on stopping down the lens to f/8.0.
Now let’s see how the lens performs in this category on full frame of the Canon EOS 5D Mark III.
| Canon 5D III, 100 mm, f/4.5 | Canon 5D III, 100 mm, f/5.6 |
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| Canon 5D III, 200 mm, f/5.6 | Canon 5D III, 200 mm, f/8.0 |
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| Canon 5D III, 300 mm, f/6.3 | Canon 5D III, 300 mm, f/8.0 |
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| Canon 5D III, 400 mm, f/6.3 | Canon 5D III, 400 mm, f/8.0 |
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The shortest focal length and its maximum relative aperture mean light fall-off amounting to as much as 41% (−1.54 EV). It is exactly the same value as in the case of the Sigma but that lens was a bit slower at that point so, overall, you can say the Tamron fares slightly better; if you stopped it down to the maximum aperture of the Sigma, its vignetting level would be lower.
Employing an aperture of f/5.6 means the decrease of vignetting to 29% (−0.99 EV). The Sigma performed a bit weaker with a result of 32%. The vignetting is still noticeable by f/8.0 and f/11.0 where it reaches, respectively, 20% (−0.66 EV) and 14% (−0.44 EV). Only after employing f/16.0 that aberration becomes imperceptible, dropping to 8% (−0.25 EV).
At the 200 mm focal length and by f/5.6 you have to take into account losing 39% of light (−1.43 EV) in the corners. That loss diminishes to 15% (−0.47 EV) on stopping down the aperture to f/8.0, and by f/11.0 it becomes practically imperceptible (6% and −0.18 EV).
Very similar results can be observed at 300 mm. At the maximum relative aperture the vignetting is 38% (−1.37 EV), and on stopping down the aperture to f/8.0 it decreases to a value of 19% (−0.61 EV); by f/11.0 it becomes imperceptible (5% and −0.15 EV).
There are no big changes at the maximum focal length if you compare it to 200 and 300 mm. By f/6.3 the vignetting is 39% (−1.43 EV) and it decreases to 20% (−0.65 EV) on stopping down the aperture to f/8.0. By f/11.0 that aberration becomes imperceptible and our official result was 5% (−0.15 EV).
Vignetting values at the longer end of the focal spectrum are practically identical with the performance of the Sigma C 100-400 mm and a bit worse than the results of faster brand name instruments.
| Canon 5D Mk III, 100 mm, f/4.5 |
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| Canon 5D Mk III, 200 mm, f/5.6 |
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| Canon 5D Mk III, 300 mm, f/6.3 |
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| Canon 5D Mk III, 400 mm, f/6.3 |
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