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EXCERPT page containing first few paragraphs. 2023-12-02 01:04:08

24-megapixel Leica SL
Leica 90mm f/4 Macro-Elmar-M

Aperture Series: Bristlecone Log On Hillside, Harsh Sunlight

This series from f/4 - f/8 looks at peak sharpness under harsh daylight conditions. I am not keen on the lighting or composition, but it is a useful study.

Bristlecone Log On Hillside, Harsh Sunlight

Adobe Camera Raw 9.6 (625): ACR settings, Camera Profile = Embedded. No lens corrections.

It is very difficult to focus an f/4 lens on a scene like this, even with a high-res EVF: it is very eas to focus just a hair too close or too far. For this reason, use of f/5.6 or f/8 is strongly advised with a scene like this.

Sharpness is optimal by f/5.6, with f/8 bringing more depth of field. There are some variations in sharpness near to far (corners oddly sharp at distance versus mildly blurred more central areas at some distance), suggesting a mild field curvature. However, this may actually be due to an interaction with sensor cover glass (increased astigmatism).

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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 4,5.6,8 available in full article

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