Archived posting to the Leica Users Group, 2003/05/17

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Subject: Re: [Leica] Vignetting of Summicron M 2/28mm ASPH
From: Jerry Lehrer <jerryleh@pacbell.net>
Date: Sat, 17 May 2003 18:20:58 -0700
References: <03E63C98-8802-11D7-A816-0050E42E6E0B@shaw.ca> <001101c31c26$03b78680$0100a8c0@liyue> <00ad01c31c38$3968ed70$70a72350@home> <003101c31c6e$37cd7d60$6401a8c0@oemcomputer> <006101c31c7a$166f8120$6400a8c0@mtwk.sps.mot.com> <001101c31cca$50826440$6401a8c0@oemcomputer>

Don

Can we assume that by your expression "retro 50" you are
referring to a retrofocus R50 as used in the Leica SLRs?
Or do you mean something else?

Jerry

Don Dory wrote:

> Phong,
> I was implying that if an element was moved out of it's designated location
> +/-0.003 then bad things happen to the light.  The designs coming out of
> Solms are fabulous, but there are continuing occasional tales of really bad
> results, sometimes flare, sometimes severe vignetting, sometimes not as
> crisp as supposed to be.  The only logical conclusions would be either an
> element out of spec or an element out of place.
>
> The +/- comes from one of Erwins bulletins when he was talking about the new
> retro 50 and how it conforms to muck tighter specs than the other 50
> Summicrons he has tested recently.
>
> Thanks for reading.
>
> Don
> dorysrus@mindspring.com
>
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Replies: Reply from "Don Dory" <dorysrus@mindspring.com> (Re: [Leica] Vignetting of Summicron M 2/28mm ASPH)
In reply to: Message from John Collier <jbcollier@shaw.ca> (Re: [Leica] Vignetting of Summicron M 2/28mm ASPH)
Message from "Y. Li" <liyue@netvigator.com> (Re: [Leica] Vignetting of Summicron M 2/28mm ASPH)
Message from "Rafael Alday" <rafaelalday@yahoo.es> (Re: [Leica] Vignetting of Summicron M 2/28mm ASPH)
Message from "Don Dory" <dorysrus@mindspring.com> (Re: [Leica] Vignetting of Summicron M 2/28mm ASPH)
Message from "Phong" <phong@doan-ltd.com> (Re: [Leica] Vignetting of Summicron M 2/28mm ASPH)
Message from "Don Dory" <dorysrus@mindspring.com> (Re: [Leica] Vignetting of Summicron M 2/28mm ASPH)