Most full-frame 50s show on a large sensor the barrel distortion, sometimes quite large as it was in the case of Nikkor AF-S 50 mm f/1.4 in which this aberration reached -2%. Noticeable problems, due to the necessity to use small focal lengths, also have lenses of 4/3 system. Leica 1.4/25 mm recorded distortion of about -1% and the pancake 2.8/25 as much as -1.7%. Compared to these results, the tested Summicron-M 50 mm f/2.0 with its result of -0.47% looks really well. In its case, geometric distortions at the edge of the frame should not be much of a problem. Together with no perspective distortions from natural and classical focal length, we get a lens accurately representing the reality, so ideal for documentary photography.
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