Nikon Nikkor Z 24 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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You have some chances to notice vignetting only in area close to the maximum relative aperture. By f/1.8 that aberration reaches a moderate level of 27% (−0.89 EV). On stopping down the aperture to f/2.0 it decreases to 21% (−0.68 EV), and by f/2.8 it becomes practically imperceptible, dropping to a value of 10% (−0.30 EV).
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After passing to a bigger full frame sensor there are far more problems – let's glance at photos below.
| 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 59% (−2.57 EV). Here the tested lens fares weaker than its reflex camera equivalent which vignetting level amounted to 50%.
When you stop the aperture down to f/2.0 vignetting decreases to a still high level of 53% (−2.18 EV). It remains quite noticeable also by f/2.8 where we got a result of 35% (−1.24 EV). A moderate value you can achieve only by f/4.0, where that aberration amounts to 25% (−0.82 EV). By f/5.6 you can notice another slight decrease to 23% (−0.74 EV), and 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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Below we present averaged out values of brightness loss shown in concentric circles as you move further away from the frame centre. The numerical value of every image, expressed in percents, shows an area limited from the top and right by 100% and from the bottom by the presented curve. The area indicates how much light overall is lost due to the vignetting effect. Please, don’t mix these percentages with the values given at the beginning of the chapter because they aren’t directly connected.
