Archived posting to the Leica Users Group, 2008/01/09
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Wow! Being a cityboy: is that water color natural? Thanks for showing, Philippe Op 8-jan-08, om 22:42 heeft Matthew Hunt het volgende geschreven: > But it caught this salmon for me! > http://gallery.leica-users.org/v/mnsh/Scot_0707/fauna/ > L1002954.jpg.html > Matthew > > -----Original Message----- > From: lug-bounces+matthew=hunt.tc@leica-users.org > [mailto:lug-bounces+matthew=hunt.tc@leica-users.org] On Behalf Of > Henning > Wulff > Sent: 06 January 2008 01:38 > To: Leica Users Group > Subject: Re: [Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens > > At 10:15 AM -0800 1/5/08, wildlightphoto@earthlink.net wrote: >> 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. >>>> > > > In Leica's case they also use the term correctly. They use the APO > designation to indicate apochromatic correction. Yes, in many cases > special low dispersion glasses can help to achieve this, but low > dispersion or anomalous dispersion glass is not essential for > apochromatic correction. > > Leica uses low dispersion glasses on various non-apochromatic > lenses as > well. > > -- > * Henning J. Wulff > /|\ Wulff Photography & Design > /###\ mailto:henningw@archiphoto.com > |[ ]| http://www.archiphoto.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 >