Panasonic Lumix G 25 mm f/1.7 ASPH.
8. Vignetting
| Olympus E-PL1, f/1.7 | Olympus E-PL1, f/2.0 |
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| Olympus E-PL1, f/2.8 | Olympus E-PL1, f/4.0 |
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You can notice the vignetting without any problems at the maximum relative aperture because it reaches 45% (−1.74 EV). It is a high level but still lower than that of the slower Olympus 1.8/25. On the other hand some 1.8/50 class lenses designed for smaller sensors can have a lower vignetting level so the result of the Panasonic is nothing to be proud of.
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On stopping down the aperture to f/2.0 you see the vignetting decrease to 37% (−1.32 EV), and after employing a relative aperture of f/2.8 that aberration amounts to 29% (−0.97 EV). The light fall-off becomes invisible by f/4.0, where it reaches only 8% (−0.25 EV).
The vignetting is not corrected by the software of the camera and in RAW files the situation looks very much the same. The results you get there are still by 1-4% higher, mainly because the RAW images have a wider angle of view, as they have to include a margin for distortion correction.
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