Viltrox AF 26 mm f/2.8 EVO
8. Vignetting
| A7R IIIa, APS-C, f/2.8 | A7R IIIa, APS-C, f/4.0 |
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At the maximum aperture, vignetting is not particularly pronounced, reaching a moderate level of 27% (-0.91 EV). Stopping down to f/4 reduces the effect to 21% (-0.68 EV), while stopping down further produces no measurable improvement.
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Switching to the larger full-frame sensor reveals noticeably more severe problems, as clearly illustrated by the images below.
| A7R IIIa, FF, f/2.8 | A7R IIIa, FF, f/4.0 |
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| A7R IIIa, FF, f/5.6 | A7R IIIa, FF, f/8.0 |
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At the maximum aperture, our measured result is extremely high, reaching 63% (−2.86 EV). However, this is very similar to the result obtained by the Nikkor, and the compact dimensions of both lenses make themselves abundantly clear in this respect.
At f/4.0, vignetting reaches 52% (-2.14 EV), while at f/5.6 and f/8.0 it decreases only slightly, to 51% (-2.04 EV) and 50% (-1.99 EV), respectively. Stopping down further has no effect on our measurements.
| Sony A7R IIIa, JPEG, f/2.8 |
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