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EXCERPT page containing first few paragraphs. 2023-03-21 17:05:31

Leica 18mm f/3.8 Super-Elmar-M ASPH

Vignetting: 18/3.8 Super-Elmar-M ASPH

Vignetting is about what one would expect, meaning that natural vignettting remains significant even after the lens has done its job (cos^4 law, reflection off the sensor, etc).

Fortunately, the M9 lens correction moderates most of the vignetting so that it goes without notice on most images.

Since the 18/3.8 SEM was originally released with 6-bit coding, tricking the M9 into using the 18/3.8 SEM lens correction entails coding the alternate lens so as to trick the M9 into applying lens correction (e.g., the Zeiss ZM 18mm f/4 Distagon).

See also the Color Shading page.

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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.
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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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Leica 18mm f/3.8 Super-Elmar-M ASPH distortion
Leica M9 + Leica 18mm f/3.8 Super-Elmar-M ASPH, ~f/8 @ 1/25 sec handheld , ISO 160

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