Nikon Nikkor Z 20 mm f/1.8 S
8. Vignetting
| Nikon Z7, APS-C/DX, f/1.8 | Nikon Z7, APS-C/DX, f/2.0 |
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There are some chances to notice vignetting but only in area close to the maximum relative aperture. By f/1.8 that aberration reaches a moderate level of 29% (−0.99 EV). On stopping down the aperture to f/2.0 it decreases to 24% (−0.80 EV), and by f/2.8 it becomes almost imperceptible, dropping to a value of 14% (−0.43 EV).
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After passing to a bigger full frame sensor there are far more problems – let's glance at photos below to assess the situation in more detail.
| Nikon Z7, FF, f/1.8 | Nikon Z7, FF, f/2.0 |
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| Nikon Z7, FF, f/2.8 | Nikon Z7, FF, f/4.0 |
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At the maximum relative aperture you have to deal with brightness loss in frame corners of as much as 57% (−2.47 EV). Here the tested lens fares a tad weaker than its reflex camera equivalent which vignetting level amounted to 49%.
When you stop the aperture down to f/2.0 vignetting decreases to a still high level of 53% (−2.17 EV). It remains quite noticeable also by f/2.8 where we got a result of 36% (−1.31 EV). A level closer to moderate values you can achieve only by f/4.0, where that aberration amounts to 30% (−0.82 EV). What's interesting, further stopping down doesn't have a measureable influence on the aberration, described in this chapter.
| Nikon Z7, JPEG, f/1.8 |
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