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Leica M240
Leica 28mm f/2 Summicron-M ASPH (2016)

Focus Shift Evaluation at MOD (Dolls, M240)

See also same scene with the 28mm f/2.8 Elmarit-M ASPH.

This page evaluates focus shift at minimum object distance (MOD). At MOD, focus shift can be more pronounced than at greater distance, but the 28/2 is prone to substantial focus shift at all distances.

Significant focus shift inflicts serious damage to image sharpness where intended/desired and thus makes obtaining optimal results on high-res digital cameras much more challenging. Focus shift is the elephant in the room, ignored when talking about sharpness, and yet little else matters when focus shift is strong.

For more on focus shift, see Making Sharp Images.

Evaluation at MOD

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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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Aperture series 2,2.8,4,5.6,8 available in full article

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