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Leica 50mm f/2 APO-Summicron-M ASPH

Focus Shift with the 50/2 APO ASPH (Pellegrino Bottles)

June 2013 lens sample, which suffered from poor flare control.

This meticulously-executed test used a focusing rail to bracket focus in precise 5mm increments; several efforts were made in order to cross check and verify. It proves a rearward focus shift with the Leica 50mm f/2 APO-Summicron-M.

Two series are shown: +0 (as focused) and -10mm (camera moved 10mm more distant). An intermediate result at -5mm is not shown, but was used to cross check.

Pellegrino bottles with ruler

Leica 24-megapixel M240 at ISO 200. Image magnification ratio of 1:19.1 as determined by measuring the ruler and assuming a 36.0mm wide sensor width, hence just over 1 meter subject to imaging plane distance.

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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 M240 + 50mm f/2 APO-Summicron-M ASPH @ f/2

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