Archived posting to the Leica Users Group, 2008/01/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Raimo K <raimo.m.korhonen@uusikaupunki.fi> >Since when do they use this designation? Since 1984 at least if not earlier. Doug Herr Sacramento http://www.wildlightphoto.com > >----- Original Message ----- >From: <wildlightphoto@earthlink.net> >To: "Leica Users Group" <lug@leica-users.org> >Sent: Saturday, January 05, 2008 3:17 PM >Subject: Re: [Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens > > >> 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 >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > > >_______________________________________________ >Leica Users Group. >See http://leica-users.org/mailman/listinfo/lug for more information