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EXCERPT page containing first few paragraphs. 2022-08-16 23:37:38

Color Bokeh

Color bokeh refers to out-of-focus areas that take on a color cast. A magenta cast dominates in the foreground, and a green cast dominates in the background, easy to see with a neutral target. See Secondary Longitudinal Chromatic Aberration or “Color Bokeh” and Spherochromaticism for details.

Distinct from the usual color bokeh described here is lateral chromatic aberration, which affects even in-focus image rendition. Lateral chromatic aberration also leaves its mark in out-of-focus areas.

Leica 75mm f/2 APO-Summicron-M ASPH

Although very well corrected for most color aberrations, the Leica 75mm f/2 APO-Summicron-M ASPH has fairly strong color bokeh. A color-neutral rendition that imparts no color effects as seen here would be highly preferable, because the background is distracting. Converting to black and white can mostly eliminate this effect (but not entirely, since there is still an “edge” from the color transition).

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Leica 75mm f/2 Summicron-M ASPH @ f/2

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