EXCERPT page containing first few paragraphs. 2021-04-12 15:25:06
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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 very minor points: at f/8 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 Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
- Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
- Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
- Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and 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.
- 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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