Olympus M.Zuiko Digital ED 45 mm f/1.2 PRO
8. Vignetting
| Olympus E-M5 II, f/1.2 | Olympus E-M5 II, f/1.4 |
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| Olympus E-M5 II, f/2.0 | Olympus E-M5 II, f/2.8 |
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At the maximum relative aperture the vignetting reaches 31% (-1.06 EV); it is not a high level if you take into account good aperture fastness of the lens. It’s enough to remind here that other equivalents of 85 mm devices had more significant brightness loss e.g. the Fujinon 1.2/56 lost 45% of light in the corners and full frame 85 mm f/1.4 instruments can have vignetting on a level of 50%. Also the Panaleica 1.2/42.5 fared weakly here with a result of as much as 54%.
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On stopping down the aperture to f/1.4 the vignetting decreases to 28% (-0.96 EV). That aberration becomes just slightly bothersome already by f/2.0 and f/2.8 where it is, respectively, 21% (-0.69 EV) and 15% (-0.46 EV). The problem disappears completely by f/4.0 where the light fall-off in the frame corners amounts to a symbolic value of 8% (-0.26 EV).
As the lens has no distortion to correct the JPEG files don’t have to be noticeably cropped; as a result the RAW files vignetting level is, within the margin of error, the same as the JPEG files vignetting (with differences ranging from 0 to 2%).
| Olympus OM-D E-M5 Mark II, JPEG, f/1.2 |
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