Archived posting to the Leica Users Group, 2008/01/08

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Subject: [Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens
From: matthew at hunt.tc (Matthew Hunt)
Date: Tue Jan 8 13:45:14 2008
References: <6170667.1199556928363.JavaMail.root@elwamui-little.atl.sa.earthlink.net> <p0623090bc3a5e07bd772@[10.1.16.128]>
 
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

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Replies: Reply from geebee at geebeephoto.com (geebee) ([Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens)
Reply from imagist3 at mac.com (Lottermoser George) ([Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens)
Reply from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens)
 In reply to: Message from wildlightphoto at earthlink.net (wildlightphoto@earthlink.net) ([Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens)
Message from henningw at archiphoto.com (Henning Wulff) ([Leica] The Tele elmarit 135 Is So A Real Pooch of a Lens)