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Sony A7R II
Sony FE PZ 28-135mm f/4G OSS

Focus Shift Aperture Series@ 28mm: Cat On Desk at Sunset (A7R II)

Background: see the general discussion of the implications of focus shift on the Picnic Table example page. That discussion is important, and not repeated here.

This example at 28mm confirms and extends the focus shift shown and discussed in detail on the Focus Shift Aperture Series@ 38mm: Picnic Table page and the other focal lengths.

Focus shift with stopping down is particularly severe at 28mm. When Sony claims “No Focus Shift or Lens Breathing” that surely must be in jest. Maybe Sony refers to focus shift when zooming.

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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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