Nikon Nikkor AF-S DX 16-80 mm f/2.8-4E ED VR
8. Vignetting
| Nikon D7000, 16 mm, f/2.8 | Nikon D7000, 16 mm, f/4.0 |
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| Nikon D7000, 30 mm, f/3.2 | Nikon D7000, 30 mm, f/4.0 |
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| Nikon D7000, 50 mm, f/3.5 | Nikon D7000, 50 mm, f/5.6 |
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| Nikon D7000, 80 mm, f/4.0 | Nikon D7000, 80 mm, f/5.6 |
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At the most difficult combination of 16 mm and f/2.8 aperture the losses of light in the frame corners amount to 40% (−1.50 EV). Although it is a high value the Nikkor still compares favourably with its rivals. At the relative aperture amounting to f/3.5 so being slower the Sony-Zeiss 16-80 mm lost as much as 42% of light. The Sigma C 17–70 mm at 17 mm and by f/2.8 reached a better result, that of 33%, but after all that 1 mm less in the focal range changes the scale of the problem noticeably.
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On stopping down the aperture to f/4.0 you see the vignetting level of the Nikkor decrease to 26% (−0.88 EV), and on employing the f/5.6 aperture that aberration reaches 17% (−0.54 EV). Further stopping down barely influences the results because by f/8.0 we got a value of 16% (−0.51 EV).
A noticeably better situation is observed at the 30 mm focal length. Here, even with the lens wide open, the vignetting reaches a moderate level of 26% (−0.88 EV), and by f/4.0 it amounts to 17% (−0.55 EV). By f/5.6 practically all the problems disappear because the result we got was just 10% (−0.31 EV).
At 50 mm the vignetting increases again. By f/3.5 it amounts to 34% (−1.20 EV), by f/4.0 it reaches 29% (−0.99 EV), and by f/5.6 it gets to 15% (−0.46 EV). Almost complete disappearance of that aberration can be observed only by f/8.0, where we assessed its level as 8% (−0.24 EV).
Another increase, this time only slight, can be observed at 80 mm where, at the maximum relative aperture, the vignetting reaches 36% (−1.29 EV). By f/5.6 it decreases to 18% (−0.58 EV), and by f/8.0 it becomes imperceptible (8% and −0.23 EV).
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