Voigtlander Color Skopar 20 mm f/3.5 SL II Aspherical review - Vignetting

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Voigtlander Color Skopar 20 mm f/3.5 SL II Aspherical

24 November 2010

Arkadiusz Olech

8. Vignetting

When it comes to the vignetting, the lens on a small APS-C/DX sensor surprised us very nicely. Taking into account its diminutive dimensions we thought that on the Nikon D200 we would see plenty of problems in this category. The thumbnails below show that the situation is not so bad after all.

Voigtlander Color Skopar 20 mm f/3.5 SL II Aspherical - Vignetting

We have some chance to notice some vignetting only near the maximum relative aperture, where it amounts to 24% (-0.82 EV). By f/1.4 this aberration is 20% and by f/5.6 it decreases to an innocuous level of 12%, disappearing completely by f/8.0.

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There’s no getting away from it, though, and on full frame we have much more problems; it can be seen very well in the thumbnails below which we got on the Nikon D3x.

At the maximum relative aperture the vignetting reaches 54% (-2.2 EV) and it decreases to 51% by f/4.0. By applying f/5.6 it is still significant and amounts to 38%. It doesn’t disappear on further stopping down because by f/8.0 it gets to 29% and by f/11 – to 25%. Further stopping down doesn’t bring any measurable effects because by f/16 the brightness loss in the frame corners is still close to 24%.