Olympus M.Zuiko Digital 25 mm f/1.8 review - Vignetting

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Olympus M.Zuiko Digital 25 mm f/1.8

30 April 2014

Arkadiusz Olech

8. Vignetting

On the one hand a small Micro 4/3 sensor is easy to correct when it comes to the vignetting; on the other hand Olympus tries to construct really small lenses so a perfect vignetting correction is never a simple task. In the case of the Olympus 1.8/25 they didn’t succeed as you can notice while glancing at thumbnails below.

At the maximum relative aperture the vignetting reaches 47% (-1.85 EV). It would be difficult to call such a result good because even the tiny Panasonic 1.7/20 fared better. By f/2.0 the vignetting decreases to 43% (-1.62 EV) and by f/2.8 it drops to 35% (-1.23 EV). That aberration is still noticeable by f/4.0 where it amounts to 27% (-0.90 EV). Only by f/5.6 and f/8.0 the vignetting level can be called moderate as it gets to 21% (−0.68 EV) and15% (−0.48 EV) respectively.

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As the Olympus 1.8/25 corrects the distortion well and doesn’t require any software assistance, JPEG images, compared to those saved as RAW files, aren’t cropped so the differences in vignetting between RAWs and JPEGs are small.