EXCERPT page containing first few paragraphs. 2021-01-22 23:59:17
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Color bokeh results from incomplete correction of chromatic errors. That includes lateral and chromatic aberration, spherochromaticism, etc. It is almost impossible to eliminate color bokeh without constraining the lens design in some serious way.
Not too much should be made of color bokeh; even Leica R or Leica M APO lenses show some color bokeh, as do even the best Nikon and Canon and Zeiss optics. Stopping down greatly reduces the effect, usually by f/4 things are “clean”.
I know of only two lenses that are truly free of color bokeh, the Coastal Optics 60mm f/4 UV-VIS-IR APO macro, and the Voigtlander 180mm f/4 APO macro, but those lenses are f/4 lenses, a major brightness compromise over an f/2.5 lens.
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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