EXCERPT page containing first few paragraphs. 2023-02-08 03:20:32
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Diffraction is a progressive loss of contrast as a lens is stopped down. Diffraction is covered in detail in Making Sharp Images.
In essence, black and white trend to gray more and more as the lens is stopped down, causing a dulling of image contrast, a loss of brilliance. With enough stopping down, fine detail is obliterated. Diffraction is a law of optical physics and affects all lenses, but the best lenses show its signs earlier (they have the “most to lose”).
Diffraction can vary slightly by lens design and by the anti-aliasing filter over the sensor, but these are minor points: at f/5.6 and smaller apertures, the effects begin to accrue. Appropriate deconvolution sharpening (see Making Sharp Images) can mitigate the effects of diffraction somewhat— typically f/11 or so.
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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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