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EXCERPT page containing first few paragraphs. 2023-02-08 02:38:46

Leica 90mm f/2.5 Summarit-M

Flare: 90mm f/2.5 Leica Summarit-M

The Leica 90mm f/2.5 Summarit-M is not a good choise for contre-jour imaging situations, and it is subject to substatial veiling flare should direct light strike the front element.

Grazing sunlight

I did not go looking for this flare example; it found itself, and hounded me; I could not make a clean shot here. Most telephoto lenses have this flare issue, and the 90/2.5 is no exception.

I expect that the 90/2 APO-Summicron-M ASPH would also be affected in a similar manner. However, since the 90/2.5 does not have a built-in lens hood, such flare issues are likely to be less troublesome with the 90/2 APO-Summicron-M ASPH, which does have a (small) built-in lens shade. Such conveniences are not to be underestimated in the field; having a hood built-in keeps the form factor and hassle factor 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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1/125 sec handheld @ ~f/5.6 ISO 160 + 2.1 stop push
Leica M9P + 90/2.5 Summarit-M

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