Voigtlander Septon 40 mm f/2 Aspherical
8. Vignetting
| Z8, APS-C/DX, f/2.0 | Z8, APS-C/DX, f/2.8 |
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Even at the maximum relative aperture, vignetting is not particularly pronounced here, reaching a modest 24% (-0.79 EV). The problem practically disappears at f/2.8 and f/4.0, where our measurements yielded 15% (-0.46 EV) and 14% (-0.43 EV), respectively.
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Switching to the larger full-frame sensor reveals noticeably more problems, as clearly illustrated by the photographs below.
| Z8, FF, f/2.0 | Z8, FF, f/2.8 |
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| Z8, FF, f/4.0 | Z8, FF, f/5.6 |
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At the maximum relative aperture, our measured result is enormous, reaching as much as 65% (−3.01 EV). At f/2.8, the aberration in question amounts to 50% (-2.01 EV), at f/4.0 it drops to 38% (-1.38 EV), while at f/5.6 it decreases to 32% (-1.13 EV). Stopping down further produces no measurable improvement.
| Nikon Z8, JPEG, f/2.0 |
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