Leica Summicron-M 50 mm f/2.0 review - Vignetting

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Leica Summicron-M 50 mm f/2.0

27 October 2009

Arkadiusz Olech

8. Vignetting

Leica M9 in its menu offers the user a function called Lens Auto Detection, which after enabling recognizes the lens, and writes its focal length in EXIF, and also has the information on its aberrations. Thanks to that, automatic vignetting correction is possible. Turning this function off makes the camera body not recognize the lens and correct its aberrations. That’s how we tested the vignetting of Summicron-M 50 mm f/2.0.

The manufacturer, in their specification, clearly shows that vignetting of the tested lens is quite large, as show on the graph below.

Leica Summicron-M 50 mm f/2.0 - Vignetting

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Our measurements basically confirm what we see above. At the maximum aperture, the light falloff in the corners of the frame reaches as much as 57% (-2.4 EV). After stopping down to f/2.8 the problems decreases to the level of 37%, and at f/4.0 of 20%. Vignetting becomes basically unnoticeable at f/5.6 and f/8.0, where it reaches 14% and 11% respectively.