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Leica M240

Compared: Noctilux, Summilux, APO-Summicron, Zeiss Planar (M240, Tioga Cabin #9 Chair)

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

The Leica 50mm f/2 APO-Summicron-M ASPH is perhaps the most highly corrected lens in the Leica M lineup, offering very high performance with a flat field (little or no field curvature).

How does the flat field of the 50mm f/2 APO ASPH pan out for scenes which are essentially planar in nature?

The question is an eminently practical one: between possible focus shifts and field curvature with each lens, a lens that delivers predictable flat field performance is a huge simplification and offers the chance to stop down much less in order to achieve peak image quality. Not every image needs this type of behavior, but in many cases it is a big advantage.

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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, Leica SL.

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.

f/0.95 Noctilux-M ASPH
f/1.4 Summilux-M ASPH
f/2 APO-Summicron-M ASPH
Zeiss ZM 50mm f/2 Planar T*
(not to scale)

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