corrected lenses I have ever used, are more tolerant of diffraction

at higher (smaller) apertures. I can't explain it, but my eyes tell me

it is so.

Sidebar: Cosina and Zeiss

It is important to know that the world-famous Zeiss lenses are

made in Japan by Cosina, the company that makes my favorite

Voigtlander CV-125 lens and others. The Japanese bought the

German company’s name. In fact both Zeiss and Voigtlander are

made in the same building I am told, just on opposite sides. My

point? Simple, these guys make good lenses and not just the

Zeiss half of the building, but IMO the Voigtlander factory

produces the most remarkable lenses I have ever used.

Voigtlander 125mm, f/2.5 APO-Lanther