Archived posting to the Leica Users Group, 2005/02/11

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Subject: [Leica] Re: Re: FS: Leitz/Leica 350mm f/4.8 Telyt-R
From: jcb at visualimpressions.com (JCB)
Date: Fri Feb 11 08:03:40 2005
References: <20050211013003.49678.qmail@web81204.mail.yahoo.com> <31687eef6991db513487343a8b4eeb58@btinternet.com>

I heard it from the mouth of Leitz, at Photokina, the year it was introduced.

JB


At 12:26 AM 2/11/2005, Frank Dernie wrote:


>AFAIK there is no such thing as "APO glass". To get APO performance a 
>combination of elements of differing characteristics and curvature is 
>required to cancel the fact that different colours diffract differently. 
>The unusual partial dispersion glasses which this requires in at least one 
>element are very expensive. Whether the 350 actually has these is 
>debatable. The fact that it is v. sharp is well documented
>Frank
>
>
>On 11 Feb, 2005, at 01:30, SEUNG MIN LEE wrote:
>
>I have never heard that it had APO glass


Replies: Reply from Frank.Dernie at btinternet.com (Frank Dernie) ([Leica] Re: Re: FS: Leitz/Leica 350mm f/4.8 Telyt-R)
In reply to: Message from leirex at sbcglobal.net (SEUNG MIN LEE) ([Leica] Re: FS: Leitz/Leica 350mm f/4.8 Telyt-R)
Message from Frank.Dernie at btinternet.com (Frank Dernie) ([Leica] Re: FS: Leitz/Leica 350mm f/4.8 Telyt-R)