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EXCERPT page containing first few paragraphs. 2023-02-08 02:55:32

Leica 21mm f/1.4 Summilux-M ASPH

Distortion: 21/1.4 Summilux-M ASPH

Distortion is of the wave type, unavoidable at this focal length for a fast lens (see the Leica 21mm f/3.4 Super-Elmar-M and the Zeiss ZM 21/4.5 Biogon).

Barrel distortion proceeds over the central 2/3 of the frame, reversing to accelerating pincushion distortion beyond that.

This level of distortion is noticeable on buildings and straight horizons, in spite of Leica’s assertions about it being “negligible”, which is a comment relative to the difficulties of making a 21mm lens.

Distortion is in line with most other 21mm lenses, and not much different from the 24mm f/1.4 Summilux-M ASPH.

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Diglloyd Guide to LEICA contains in-depth coverage of Leica M system cameras and lenses, with additional coverage of Leica M Monochrom, Leica Q.

Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.

  • Make better images by learning how to get the best results right away.
  • Save money by choosing the right lens for your needs the first time, particularly the Summilux/Summicron/Elmarit choice and/or Zeiss ZM.
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  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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Distortion for Leica 21mm f/1.4 Summilux-M ASPH
Leica M9 + Leica 21mm f/1.4 Summilux-M ASPH @ ~f/4, 1/15 sec handheld, ISO 160

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