Leica Summicron-M 28 mm f/2.0 Asph review - Vignetting

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Leica Summicron-M 28 mm f/2.0 Asph

29 March 2010

Arkadiusz Olech

8. Vignetting

Looking at the vignetting graph, published in Leica material, it was hard to believe that you can lose over 70% of light in the frame corner and the vignetting level can be very bothersome even on stopping down the lens by 3 EV.

Leica Summicron-M 28 mm f/2.0 Asph - Vignetting

It is really the case, though. Our measurements showed that at the maximum aperture in the frame corner we lose a huge amount of light – 73% (−3.81 EV). On stopping down by one stop the vignetting decreases to 62% and by f/4.0 it amounts to 52%. By f/5.6 the light fall-off in the frame corners is still big because it reaches as much as 47%. It is, by the way, in perfect accordance with the graph above. What’s more, on further stopping down we don’t see much of improvement because by f/8 the vignetting is 45% and by f/11 – still 43%.

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What can be said…small dimensions of the lens combined with wide angle, good fastness and small distance between the rear lens element and the detector (very characteristic for a rangefinder) gave here a pitiful effect indeed.