Leica Summicron-M 50 mm f/2.0
5. Chromatic aberration
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As far as chromatic aberration is concerned, it’s hard to complain about anything. The highest value of this aberration is recorded at the open aperture, but even there the level’s medium at the most. With stopping down, the aberration falls quickly becoming small.
Classical 50s or their equivalents never perform badly here. For instance, Nikkor AF-S 50 mm f/1.4 on D3x showed aberration increasing with stopping down from 0.06% to just over 0.1%. Leica 1.4/25, giving on a 4/3 sensor the same angle of view as classical 50s on a full frame, behaved similarly to Nikkor. At the maximum aperture the chromatic aberration was about 0.07% to rise to around 0.12% later.
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