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Leica 90mm f/2 APO-Summicron ASPH, R and M

Aperture Series: White Mountains STOP Sign (M240)

The “R” and “M” version of the Leica 90mm f/2 APO-Summicron ASPH are optically identical. There can of course be minor differences due to mechanical variation, but the optical formula is the same, as the MTF chart shows. s

Because your author owns the “R” version, many examples for the 90/2 APO ASPH are shot with the 90mm f/2 APO-Summicron-R ASPH using the Leica R-Adapter M.


White Mountains STOP Sign aperture series with 90/2 APO-Summicron-R 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.
  • 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 90mm f/2 APO-Summicron-R ASPH

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