Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2022-01-23 00:58:28

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

Focus Shift Aperture Series@ 38mm: Picnic Table (A7R II)

This scene is mundane, but it turns out to show quite a strong focus shift to the foreground with the Sony FE PZ 28-135mm f/4G OSS at the 38mm setting. The several other example pages show similar behavior.

The focus shift with stopping down is pronounced, a negative for still photography. While the Sony 28-135/4G holds sharpness at the point of focus (barely), the zone of focus shifts visibly forward. The shift is significant enough that the shape of the image changes slightly, which might be an issue for video if the aperture is changed mid-stream. See the crops.

The main and more problematic issue is that focus shift is a challenge in anticipating how the zone of focus will intersect the subject matter, in other words the visual impact of the subject versus the foreground and background, a crucial consideration for 4K video in particular, or stills—with 4K video, even the smallest focusing errors pop out as distracting.

Article continues for subscribers...

Diglloyd Guide to Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only 68 cents a day ($249.95)!

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 4,5.6,9,13 available in full article

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2021 diglloyd Inc, all rights reserved.