Archived posting to the Leica Users Group, 2001/12/28

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Subject: Re: [Leica] Expensive glass.....
From: bachchaconne@my-deja.com
Date: Fri, 28 Dec 2001 16:41:35 +0800

"This lens is nothing more than a simplified version of a Summicron
which retains the same focusing system."
Identifying Leica Lenses, Ghester Sartorius.

This Elcan 2/50 has 4 elements in 4 groups and is the Ernostar type,
not a Tessar (4 elements in 3 groups).  It was close in size to the
'Cron but lighter in weight, being 220g, 40g less than the latter.
(because of fewer glass?) However, the Elcan had a longer minimum
focusing distance of 3.5 feet/107 cm.

Andrew
>In a message dated 12/24/01 6:53:24 AM Eastern Standard Time, 
>bachchaconne@my-deja.com writes:
>
>> The Elcan 2/50 was a simplified version of the 'Cron. 
>
>No. the Elcan 2/50 is a four-element lens and would almost certainly be an 
>updated Elmar/Tessar type triplet with the rear two elements cemented; the 
>contemporary 50/2 Summicron was a Gauss design, either the DR/Rigid 7-element 
>or 11817, the first 6-element lens. See both Lager, Rogliatti and Leitz 
>sources. Compactness appears to be the reason the U.S. Government 
>commissioned the Elcan.
>
>Seth     LaK 9 


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