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  1. Etiennef

    apo?

    According to the Wikipedia article posted earlier: An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses. Is this not exactly what you are saying ED optics does? I...
  2. Etiennef

    apo?

    Yeah, but that's as far as I know It's the same thing: APO/Apochromat = ED/Extra low Dispersion optics. https://en.wikipedia.org/wiki/Apochromat This page seems to support it as well: http://www.overgaard.dk/leica_definitions.html As well as this...
  3. Etiennef

    apo?

    Perhaps a silly question; but is not "APO" just Leicas own designation for what other manufacturers call ED, HD, XD, etc..?? Basically It's just some sort of indication that the optics in question counteract color fringing / chromatic aberration. At least that's what I thought...
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