Archived posting to the Leica Users Group, 2004/11/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On 11/3/04 10:59 PM, "Slobodan Dimitrov" <s.dimitrov@charter.net> typed: > I wouldn't go so far as to say that APO is a term projecting absolute > quality. It's more in the line of a relative value. > It's my understanding that apo lenses focus all the color sources at a > specific focus distance set by the manufacturer. The other ranges, more or > less, work like any other optic. > I'll gladly stand corrected if I'm wrong. > S. Dimitrov To me there are two definitions of APO. One for the better lens design companies and one for the unwashed masses. For Leica Hasselblad etc it means they've really lined all three major colors to hit the same film plane at the same time with a tele lens. Otherwise apparently not even considered. They'd just go for two. For Tamron (My spell checker insists it's Tampon) or what ever companies you'd call the unwashed masses (I'm Bullish on Sigma) the definition of AP0 is: It cost $199 instead of $99 and it's not a total piece of junk. It's ok to use in public. Somewhere in the lens assembly there is a part not made of plastic. And the glass is real glass not acrylic. Real nice typography on the lens barrel. They hired a graphic artist who does it full time. :) Mark Rabiner Photography Portland Oregon http://rabinergroup.com/