Venus Optics LAOWA Argus 28 mm f/1.2 FF
8. Vignetting
| Nikon Z7, APS-C/DX, f/1.2 | Nikon Z7, APS-C/DX, f/1.4 |
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At the smaller detector you get some chances to notice vignetting only in the area closest to the maximum relative aperture. By f/1.2 this aberration reaches a moderate level of 28% (−0.96 EV), by f/1.4 it decreases to 21% (−0.67 EV), and by f/2.8 it becomes practically imperceptible and decreases to a value of 12% (−0.38 EV).
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After passing to the bigger full frame sensor there are more problems and they are clearly visible in photos, presented below.
| Nikon Z7, FF, f/1.2 | Nikon Z7, FF, f/1.4 |
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| Nikon Z7, FF, f/2.0 | Nikon Z7, FF, f/2.8 |
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At the maximum relative aperture you have to take into account a loss of as much as 62% of light in frame corners (-2.80 EV) and after employing f/1.4 aperture this value decreases slightly to 56% (-2.39 EV). By f/2.0 and f/2.8 you still will be able to notice vignetting without any problems, as we got the following results: 45% (-1.71 EV) and 39% (-1.45 EV). By f/4.0 you deal with a level of 35% (-1.23 EV), that decreases to 31% (-1.07 EV) on stopping down the aperture to f/5.6. Further stopping down makes vignetting level drop by just one percentage point at the most.
| Nikon Z7, JPEG, f/1.2 |
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