EXCERPT page containing first few paragraphs. 2020-01-29 04:03:59
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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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