Leica Summicron-M 50 mm f/2.0
8. Vignetting
The manufacturer, in their specification, clearly shows that vignetting of the tested lens is quite large, as show on the graph below.
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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.
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