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Lens review

Panasonic G 20 mm f/1.7 ASPH.

29 October 2010
Szymon Starczewski

8. Vignetting

We were very curious about the results the tested lens gets in the vignetting category. On the one hand a small 4/3 sensor creates favourable conditions for correcting this aberration. On the other hand, though, we deal here with a combination of small dimensions of the lens, good fastness and a quite wide angle of view.

The thumbnails below allow us to assess the lens’s performance here.

Panasonic G 20 mm f/1.7 ASPH. - Vignetting

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You can say a small surprise awaits us in this category. The result the Panasonic 1.7/20 got here is perhaps the weakest of all 4/3 or Micro 4/3 lenses we’ve tested so far. At the maximum relative aperture the vignetting reaches quite high level of 44% (-1.65 EV). On slight stopping down to f/2.0 this aberration’s level decreases to 34%. By f/2.8 the vignetting is still visible and it amounts to 24%. Only by implementing f/4.0 and f/5.6 apertures we can reduce it to a not bothersome level of 16% and 13% respectively.


Panasonic G 20 mm f/1.7 ASPH. - Vignetting