Panasonic Leica DG Summilux 12 mm f/1.4 ASPH
8. Vignetting
| Olympus E-M5 II, f/1.4 | Olympus E-M5 II, f/2.0 |
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| Olympus E-M5 II, f/2.8 | Olympus E-M5 II, f/4.0 |
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At the maximum relative aperture the vignetting is distinct, reaching 41% (−1.53 EV). Still the result is not especially high if you compare it to similar devices designed for bigger sensors. The Fujinon XF 16 mm f/1.4 R WR lost as much as 49% light in corners and the Canon EF 24 mm f/1.4L II USM as much as 78%.
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A very swift decrease of vignetting on stopping down is another asset of the Panaleica. By f/2.0 its level is just 17% (−0.55 EV), and by f/2.8 it becomes almost imperceptible, amounting to 10% (−0.29 EV).
Vignetting level for RAW files seems to be just slightly higher than for JPEG files. A difference amounting to 1-3% mainly stems from cropping JPEGs after distortion correction.
Below we present averaged out values of brightness loss shown in concentric circles as you move further away from the frame centre. The numerical value for every image, expressed in percents, shows the area limited from the top and right by 100% and from the bottom by the presented curve. The area indicates how much light overall is lost due to the vignetting effect. Please don’t mix these percentages with the values given at the beginning of the chapter because they aren’t directly connected.
| Olympus O-MD E-M5 II, JPEG, f/1.4 |
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