Archived posting to the Leica Users Group, 2007/09/25

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Subject: [Leica] 21mm Lens Questions
From: red735i at earthlink.net (red735i@earthlink.net)
Date: Tue Sep 25 11:08:39 2007
 
It appears that there are differences... basically the third element in ( 
from each end) is thicker,,,,,,  there are most likely more differences.

Didier.. you can read the MTF chaarts which I can not... how do the 2 Zeiss 
lenses compare optically?


Frank

>
>Not the same, but comparable. 
>
>Biogon:
>http://tinyurl.com/267sul 
>
>Skopar 21/4:
>http://tinyurl.com/yrh8pg 
>
>
>
>
>>The 4.5 Biogon and the 4 Cosina look like the same optical formula.
>