EXCERPT page containing first few paragraphs. 2023-12-05 04:49:46
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This page applies to any lens with spherical aberration. The 50/1.4 Planar behaves similarly to the 85/1.4 Planar shown here. See Spherical Aberration and Focus Shift for an explanation of focus shift as well as the extended coverage of focus shift in Making Sharp Images.
Early in the testing phase back in 2007 when your author was still learning about focus shift, six carefully-shot field tests against Canon 85mm lenses showed a mismatched zone of focus made A/B comparisons invalid even at f/8. Yet the 85 Planar produced beautiful and crisp results when shot by itself.
Here, the 10X “Live View” feature of the Canon EOS 1D Mark III was use≠d for accurate focus The shift can actually be seen in Live View in real time.
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