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36 megapixel Sony A7R
Sony / Zeiss FE 16-35/4 ZA OSS Vario-Tessar

Focusing and Focus Shift Mitigations

The various series taken with the Sony 16-35mm f/4 OSS show a pronounced focus shift. Thus understanding the focus shift behavior and camera settings is critical to getting the best out of the lens.

Mitigating focus shift

If shooting at f/5.6 or f/8, focus at the shooting aperture, either in manual focus mode or autofocus, ditto for f/11 and f/16.

However, stopping well down creates a source of ambiguity: it becomes increasingly difficult for either the human eye or the camera autofocus to distinguish the correct focus due to too much depth of field, and decreased brightness.

These behaviors are assumed to be identical on the A7s/A7/A7II/A7R/RX1R, but the user should confirm the camera behavior, particularly with firmware updates.

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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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