Are Z lenses APO lenses?

Started 6 months ago | Discussions thread
davethebirder Regular Member • Posts: 436
Re: Are Z lenses APO lenses?

Z6User wrote:

SrMi wrote:

Some Voigtlander Z lenses are APO (APO Lanthar 35mm and 50mm).

But how are they in practice? As I understand it, APO is a marketing designation.

No, APO is short for apochromatic ...... and are lenses which are corrected against "longitudinal chromatic aberrations" (LCAs) ....... ie CAs caused by distance (Z axis) ...... usually red fringing in front and green behind the plane of focus, .....

APO is a real optical term and these corrected lenses should not suffer from LCAs ...... manufacturers are quite rightly quick to designate their corrected glass as APO ......

........... neither of the following are APOs!

Sometimes manufacturers use APO when a lens is only partially corrected ....... ie the Sigma 150mm F2.8 macro APO where slight LCAs still remain .........

 davethebirder's gear list:davethebirder's gear list
Nikon D750 Nikon D500 Sigma 150mm F2.8 EX DG Macro HSM Nikon AF-S Teleconverter TC-14E III Nikon AF-S Nikkor 600mm F4E FL ED VR +1 more
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