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