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Sony A7R IV

Diffraction Considerations for Sony A7R IV

This page discusses considerations for diffraction on the Sony A7R IV, which has 3.74 micron photosites—extremely small.

The effects of diffraction will be vary depending on optical performance: a mediocre lens has less to lose, the wavelength of light involved (blue resolves much better than red and is thus affected more quickly). Subject matter interacts with it all, particularly in terms of textural detail on relatively low contrast subject matter. Use of pixel shift (or not) can make the effects more/less obvious too.

Diffraction mitigating sharpening can help, but never improves tonality and at some point can never 'get it back'.

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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.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.

Aperture series 2,2.8,4,5.6,8 available in full article
f4 @ 1/200 sec pixel shift, ISO 100; 2019-09-14 18:23:18
Sony A7R IV + Voigtlander FE Macro APO-Lanthar 65mm f/2 Aspherical
RAW: LACA corrected, vignetting corrected, USM {5,50,0}

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