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Lens review

Voigtlander Color Skopar 28 mm f/2.8 SL II

6 April 2013
Arkadiusz Olech

8. Vignetting

The chances that a „pancake” lens is going to show low vignetting on full frame are really scant. Despite that fact the lens’s performance on the smaller detector surprised us very nicely. The thumbnails showing the vignetting results on the sensor of the Canon 50D you can see below.

Voigtlander Color Skopar 28 mm f/2.8 SL II - Vignetting


At the maximum relative aperture the vignetting is noticeable but still can be described as moderate. The brightness loss in the corners amounts to 28% (-0.94 EV). By f/4.0 the problem disappears almost completely – in that case the vignetting gets to just 11% (-0.34 EV). Further stopping down helps just slightly because by f/5.6 the vignetting is 10% (-0.30 EV).

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As we already mentioned, the full frame is a law unto itself and the thumbnails below show it well.

Voigtlander Color Skopar 28 mm f/2.8 SL II - Vignetting


In this case, at the maximum relative aperture, you must take into account the loss of 65% of light (-3.07). By f/4.0 the vignetting is still high, reaching 44% (-1.69 EV). You can call the level of this aberration moderate only by f/5.6 where the brightness loss in the corners is 30% (-1.03 EV). By f/8 and f/11 the vignetting gets to 25% (-0.84 EV). Further stopping down doesn’t have any influence over the value of this aberration.

On the one hand you can lament the fact that you have to lose as much as 3 EV in the corners – it is a serious loss of light. On the other hand, though, nobody sensible expects that a “pancake” lens can have low vignetting. It is also worth mentioning that the full- size Canon EF 28 mm f/2.8 IS USM fared only slightly better.

Voigtlander Color Skopar 28 mm f/2.8 SL II - Vignetting