Are Z lenses APO lenses?

Started 6 months ago | Discussions thread
LarsHP
LarsHP Contributing Member • Posts: 608
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):

https://www.merriam-webster.com/dictionary/apochromatic

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) :

https://en.wikipedia.org/wiki/Ernst_Abbe#Life_work

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 Tamron SP 150-600mm F5-6.3 Di VC USD G2 +13 more
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