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Lens review

Venus Optics LAOWA 7.5 mm f/2 MFT

9 October 2017
Maciej Latałło

8. Vignetting

Let’s have a look at thumbnails below to assess the vignetting level of the tested lens – these are JPEG files we got with the help of the Olympus OM-D E-M5 Mark II.

Olympus E-M5 II, f/2.0 Olympus E-M5 II, f/2.8
Venus Optics LAOWA 7.5 mm f/2 MFT - Vignetting Venus Optics LAOWA 7.5 mm f/2 MFT - Vignetting
Olympus E-M5 II, f/4.0 Olympus E-M5 II, f/5.6
Venus Optics LAOWA 7.5 mm f/2 MFT - Vignetting Venus Optics LAOWA 7.5 mm f/2 MFT - Vignetting


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
Venus Optics LAOWA 7.5 mm f/2 MFT - Vignetting