Voigtlander Color Skopar 28 mm f/2.8 SL II
8. 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.
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.
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