Leica Apo-Summicron-M 75 mm f/2.0 Asph
7. Coma and astigmatism
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The Leica 2/75 is a relatively fast lens so the coma correction might be difficult in its case. The tested lens passed our test with flying colours, though. Even in the same corner of the full frame that off-axis aberration is visible just symbolically.
One glance at MTF graphs, which Leica shows for its own lens, and we know that even the producer allows the presence of noticeable astigmatism – the lens’s correction of it is far from perfect. Our measurements more or less confirm it. The average difference between vertical and horizontal MTF50 values amounted to 9% which is a good, but hardly outstanding result.
