Tamron 18-400 mm f/3.5-6.3 Di II VC HLD
8. Vignetting
| Nikon D7000, 18 mm, f/3.5 | Nikon D7000, 18 mm, f/5.6 |
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| Nikon D7000, 50 mm, f/4.5 | NIkon D7000, 50 mm, f/5.6 |
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| Nikon D7000, 100 mm, f/5.3 | Nikon D7000, 100 mm, f/8.0 |
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| Nikon D7000, 200 mm, f/6.0 | Nikon D7000, 200 mm, f/8.0 |
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| Nikon D7000, 400 mm, f/6.3 | Nikon D7000, 400 mm, f/8.0 |
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At the combination of 18 mm and f/3.5 aperture the lens loses as much as 39% (−1.44 EV) of light in the frame corners. The Sigma 18-300 mm lost 33% of light and the Nikkors 18-300 mm 35% and 41% respectively. All lenses mentioned above seem to represent a similar level although once again it must be said the Tamron’s task was the most difficult as its focal range is the widest.
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If you stop down the tested lens to f/4.0 the vignetting decreases to 35% (−1.26 EV). By f/5.6 it drops to 23% (−0.74 EV), and by f/8.0 to 15% (−0.48 EV). Further stopping down doesn’t have any measurable influence on this aberration.
The vignetting problems end at 50 mm where, at the maximum relative aperture, it amounts to just 11% (−0.35 EV), dropping to 8% (−0.23 EV) on stopping down the aperture to f/5.6.
Very similar results you observe at 100 mm. In that case the vignetting by f/5.3 and f/5.6 is, respectively, 13% (−0.41 EV) and 12% (−0.38 EV). By f/8.0 it decreases to a value of 5% (−0.15 EV).
At 200 mm and f/6.0 relative aperture the brightness loss in the frame corners is 16% (−0.50 EV); it decreases to an imperceptible value of 8% (−0.24 EV) on stopping down the aperture to f/8.0.
After passing to the 400 mm focal lengths the results in this category become just slightly different. By f/6.3 the vignetting is 17 % (−0.55 EV), and by f/8.0 it amounts to just 9% (−0.26 EV).
| Nikon D7000, 18 mm, f/3.5 |
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| Nikon D7000, 50 mm, f/4.5 |
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| Nikon D7000, 100 mm, f/5.3 |
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| Nikon D7000, 200 mm, f/6.0 |
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| Nikon D7000, 400 mm, f/6.3 |
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