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fact that different wavelengths of light refract slightly differently when passing through your lens. This causes some wavelengths to be misfocused, have different magnification and/or get shifted lat ...

ngineering and Leica enforcement of quality standards. (Thanks, Diego!)

If you have information about the operation of other Japanese-German partnerships, please let me know.

You are most likely seeing classic chromatic aberration (CA), the details of which are explained in beautiful detail by Van Walree. (See also HyperPhysics or Wikipedia.) In short, chromatic aberration ...

The relationship between Panasonic and Leica seems somewhat different. It is described as a collaboration, although Panasonic's version of events seems to suggest Panasonic

From what I have heard, Zeiss people were involved in the design of Sony's Zeiss lenses and they are involved in the manufacture of the lenses too, though the lenses are made in Japan