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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.
- 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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- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
- 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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