Archived posting to the Leica Users Group, 2008/01/05

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Subject: [Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens
From: wildlightphoto at earthlink.net (wildlightphoto@earthlink.net)
Date: Sat Jan 5 05:17:42 2008
 
Raimo K <raimo.m.korhonen@uusikaupunki.fi> wrote:

>APO means apochromatic correction of the lens, there are no apochromatic 
>elements.

In Leica's case, APO is the designation they use for the extra-low 
dispersion glass which their optical designers feel is essential to 
designing lenses with apochromatic performance.  This is like Nikon's use of 
the ED designation for their extra-low dispersion glass.  Raimo is correct 
that there are no apochromatic elements, but there is APO glass which is 
used to design apochromatic lenses.



Doug Herr
Sacramento
http://www.wildlightphoto.com
Replies: Reply from raimo.m.korhonen at uusikaupunki.fi (Raimo K) ([Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens)