Archived posting to the Leica Users Group, 1998/06/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 10:33 AM 6/6/1998 -0400, Dan Cardish, you wrote... >I'm still looking for an explanation of what the word "APO" means. And >not a technical one about variable indices of refraction, etc. > >Dan C. > "apo-" is a Greek combining form meaning "away" or "from". "a-" is also Greek meaning "without". Hence, achromatic--without color (aberration). Dictionary definitions of the words achromatic and apochromatic seem to imply that they mean pretty much the same thing--without chromatic aberration. To me, these words are essentially meaningless with out attaching some specific technical meaning to them, as Erwin (thanks, Erwin, I've been wondering about these terms for some time) has done. - -Mike