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Leica 16-18-21mm f/4 Tri-Elmar-M ASPH

16-18-21mm f/4 Tri-Elmar-M ASPH

The Leica 16-18-21mm f/4 Tri-Elmar-M ASPH (about $6295) includes the Universal Wide Angle Finder (as of 2012 in the USA).

While the Tri-Elmar-M is not designed as a zoom lens, it can be used at any intermediate focal length settings, though such intermediate settings presumably are not optimal. Still, there is likely to be modest performance loss especially with some stopping down.

Worth noting is that for an f/4 lens (or f/3.8)— the practical diffraction limit of a high-performing lens is around f/8 for the tiny photosites of high resolution digital cameras, such as the Sony A7R; this is visible in the slight drop in contrast at f/8 in the MTF charts, a trend which accelerates at f/11.

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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.
  • Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning. Processing parameters are discussed and shown.
  • 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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Leica 16-18-21mm f/4 Tri-Elmar-M ASPH optical layout at f/4
Leica 16-18-21mm f/4 Tri-Elmar-M ASPH

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