Venus Optics LAOWA 7.5 mm f/2 MFT
8. Vignetting
| Olympus E-M5 II, f/2.0 | Olympus E-M5 II, f/2.8 |
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| Olympus E-M5 II, f/4.0 | Olympus E-M5 II, f/5.6 |
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The aperture of f/2.0 combined with an angle of view of 110 degrees and very small dimensions of the lens made us earlier worry about the vignetting. Our worries were justified… At the maximum relative aperture the lens loses as much as 67% (−3.24 EV) of light, settling a kind of negative record for the Micro 4/3 sensor. It’s not the end of its problems. The vignetting reacts weakly to stopping down the aperture – by f/2.8 you still deal with a high level of brightness loss, that of 59% (−2.57 EV), and also by f/4.0 you don’t have any problems to notice it as it amounts to 51% (−2.04 EV). A distinct level of this aberration you see by f/5.6, f/8.0 and f/11.0 where we obtained the following results: 45% (−1.75 EV), 41% (−1.54 EV) and 40% (−1.48 EV) respectively.
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| Olympus O-MD E-M5 II, JPEG, f/2.0 |
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