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EXCERPT page containing first few paragraphs. 2023-03-21 16:43:41

Secondary Color Correction ('Purple Fringing') vs Zeiss ZM 85/2 and 85/4 (Barn Interior, 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.

This 3-way comparison is found under the 90mm f/2 APO-Summicron-R ASPH section.

Read the comparison.

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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.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Leica.

Leica 90mm f/2 APO-Summicron-R ASPH , Zeiss ZM 85/4 Tele-Tessar, Zeiss ZM 85/2 Sonnar
(not to scale)
Leica 90mm f/2 APO-Summicron-R ASPH

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