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EXCERPT page containing first few paragraphs. 2023-02-03 05:56:46

Leica 75mm f/2 APO-Summicron-M ASPH

75/2 APO Flare

Direct sunlight or other bright light onto the front lens elements generates severe flare:

The round lens shade on the 75mm f/2 APO-Summicron-M is entirely inadequate for many shooting situations. Always shield the front lens element from direct light. This is true of many Leica M lenses, and most lenses in general.

Veiling flare from sunlight striking front lens element

When sunlight as non-image-forming light hits the front lens element, all heck breaks loose, as shown. This type of flare is not improved with aperture (stopping down).

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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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Variants unshielded, shielded available in full article
Leica M240 + Leica 75/2 APO-Summicron-M @ ~f/5.6

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