Nikon Nikkor AF-S 24-70 mm f/2.8E ED VR
8. Vignetting
| Nikon D7000, 24 mm, f/2.8 | Nikon D7000, 24 mm, f/4.0 |
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| Nikon D7000, 45 mm, f/2.8 | Nikon D7000, 45 mm, f/4.0 |
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| Nikon D7000, 70 mm, f/2.8 | Nikon D7000, 70 mm, f/4.0 |
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At a very difficult combination of 24 mm and f/2.8 aperture the vignetting is practically imperceptible, amounting to just 12% (−0.37 EV). The change of aperture to f/4.0 makes it decrease to 5% (−0.15 EV).
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The middle of the focal range is very similar: by f/2.8 the vignetting reaches 14% (−0.44 EV), and by f/4.0 it is just 4% (−0.12 EV).
Using the maximum focal length and the f/2.8 aperture entails a brightness loss of 22% (−0.72 EV). The problem stops being important after stopping down to f/4.0 where the vignetting level reaches just 8% (−0.24 EV).
Now let’s check how the situation looks on full frame.
| Nikon D3x, 24 mm, f/2.8 | Nikon D3x, 24 mm, f/4.0 |
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| Nikon D3x, 45 mm, f/2.8 | Nikon D3x, 45 mm, f/4.0 |
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| Nikon D3x, 70 mm, f/2.8 | Nikon D3x, 70 mm, f/4.0 |
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If you join the wide angle and f/2.8 you have to take into account a loss of light of 46% (−1.80 EV) in the frame corners. It is a lot but still you have to take into account the results of other lenses with the same parameters in this category. The new Nikon compares favourably here as it fares only a tad worse than its predecessor but better than many of its rivals, the new, expensive Canon 24-70 mm f/2.8 II among them.
By f/4.0 the vignetting decreases to a level of 32% (−1.11 EV), and by f/5.6 it is 23% (−0.75 EV). Further stopping down doesn’t have any significant influence over that aberration because by f/8.0 its level amounts to 19% (−0.61 EV), and by f/11 it reaches just 14% (−0.45 EV).
In the middle of the focal range the problems are even less pronounced. By f/2.8 the vignetting gets to 42% (−1.59 EV) and by f/4.0 it decreases to 25% (−0.85 EV). By f/5.6 and f/8.0 apertures the vignetting stops being bothersome, amounting respectively to 13% (−0.41 EV) and 7% (−0.21 EV).
In the case of the 70 mm focal length and the maximum relative aperture the brightness loss in the frame corners amounts to 40% (−1.49 EV). That aberration decreases to 23% (−0.77 EV) on stopping down the aperture to f/4.0 and to 15% (−0.48 EV) when you employ f/5.6. By f/8.0 the problem stops being visible as the vignetting drops to merely 10% (−0.32 EV).
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