Are Z lenses APO lenses?

Started Aug 27, 2022 | Discussions thread
LarsHP Contributing Member • Posts: 672
Re: Are Z lenses APO lenses?

ipopov wrote:

APO (apochromatic) has never meant "no LOCA". The term was introduced by Zeiss to mean "chromatically corrected for three wavelengths". This does not mean "no LOCA". In fact, non-APO lean can very well be better in terms of CA that a true APO lens (by original Zeiss definition).

This is not entirely true. It means free of chromatic aberrations (as well as spherical):

It was Ernst Abbe at the Carl Zeiss factory, who in 1886 coined the term when inventing that type of lens correction, which means it "eliminates both the primary and secondary color distortion" (color distortion = chromatic aberration) :

In other words, it does mean free of longitudinal chromatic aberrations, since that is a type of chromatic aberration.

 LarsHP's gear list:LarsHP's gear list
Nikon Z7 Nikon Z6 Leica APO-Summicron-M 90mm f/2 ASPH Voigtlander 15mm F4.5 Super Wide Heliar Nikon D600 +13 more
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