Voigtlander Nokton 25 mm f/0.95 review - Vignetting

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Voigtlander Nokton 25 mm f/0.95

14 December 2010

Arkadiusz Olech

8. Vignetting

Vignetting in such a fast lens is unavoidable. In all classic full frame 1.4/50 and 1.8/50 devices it is huge and can even exceed the level of 3 EV. We were curious about the result of the Nokton in this category because of its really extreme fastness but, on the other hand, its task is easier as it project light on a small 4/3 sensor.

Let’s check the level of vignetting for particular aperture values.

Voigtlander Nokton 25 mm f/0.95 - Vignetting

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At the maximum relative aperture it amounts to 51% (-2.08 EV), so it is really high but still not as high as in the case of some full frame 50 mm lenses which performance was simply record-breaking here. On stopping down to f/1.4 the vignetting decreases, amounting to a still bothersome value of 34%. Its influence won’t worry us only by f/2.0 where the brightness loss in the frame corners amounts to 19%. The aberration becomes imperceptible by f/2.8 where its value was determined by us as 8%.