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EXCERPT page containing first few paragraphs. 2023-02-08 03:04:50

Leica 21mm f/3.4 Super-Elmar-M ASPH

Distortion: 21mm f/3.4 Super-Elmar-M ASPH

Distortion (wave type from barrel to pincushion) is very low for a 21mm lens.

Tthe Zeiss ZM 21mm f/4.5 Biogon has lower distortion, but it also has color shading issues on the M9 due to extreme ray angles.

The ~1.3% distortion can be visible with an even edge-to-edge horizon or human-made structure, but you’ll be hard-pressed to find a relatively fast aperture 21mm lens with less distortion that performs nearly so well as the 21/3.4.

See also the comparison with the 16/18/21mm f/4 Tri-Elmar-M ASPH.

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Distortion for Leica 21mm f/3.4 Super-Elmar-M ASPH
Variants uncorrected, corrected available in full article
Leica 21mm f/3.4 Super-Elmar-M

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