Archived posting to the Leica Users Group, 2000/11/10

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Subject: Re: [Leica] Summitar, Elmar, Jupiter
From: Marc James Small <msmall@roanoke.infi.net>
Date: Fri, 10 Nov 2000 14:57:33 -0500

At 12:00 PM 11/6/2000 +0100, Stanislaw B.A. Stawowy wrote:
>Hello friends!
>I recently tested these three lenses:
>Coated Summitar 2/50 collapsible
>Coated Industar 22 3.5/50 collapsible (is this a Elmar copy?)
>Coated Jupiter 3 1.5/50 - Sonnar copy


These are three distinct designs, the Industar being an Elmar copy, the
Summitar being an unsymmetrical double-Gauss design (as was the Zeiss
Biotar and Leitz' own Summar, Summarit, and Summicron designs), while the
Jupiter is a copy of the epic Sonnar design of Ludwig Bertele.  

The Elmar/Tessar design has four elements in three groups, the Summitar
seven elements in four groups, and the Jupiter/Sonnar seven elements in
three groups.

I would suspect that the 1.5/50 Jupiter-3 would outperform the other two at
f/1.5, and the Summitar would outperform the Industar-22 at f/2.

Marc

msmall@roanoke.infi.net  FAX:  +540/343-7315
Cha robh bas fir gun ghras fir!