Olympus M.Zuiko Digital 12 mm f/2.0 ED
8. Vignetting
At the maximum relative aperture the brightness loss in the frame corners reaches a high level for the Micro 4/3 system – that of 40% (-1.49 EV). Fortunately on stopping down by one stop you can see this aberration decrease by over 20%. By f/2.8 the vignetting level is already 19% (-0.61 EV). The problem practically disappears completely by f/4.0, where the vignetting amounts to just 11%.
Because of the program distortion correction RAW files have a bit wider angle of view that JPEG files. That’s why the vignetting measured using the former format is a bit higher as well. However, in this case the differences are not big - the level of RAW vignetting is just 2-4% higher than that of JPEG files.
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| JPEG | RAW |
| f/2.0 | f/2.0 |
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| f/2.8 | f/2.8 |
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| f/4.0 | f/4.0 |
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