Archived posting to the Leica Users Group, 2002/07/24

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Subject: Re: [Leica] OT: Sonnar lens design
From: "dante@umich.edu" <dante@umich.edu>
Date: Wed, 24 Jul 2002 08:28:12 -0400

You can see the two major Sonnar designs, the 50/1.5 and the 85/2 at

http://www.dantestella.com/technical/nikoleic.html

As for the others,

The 90/2.8 G and 90/2.8 M-Hexanon are Ernostar-type lenses, which are an
earlier form of telephoto Sonnar.

The Contax T and Rollei 35S are five-element Sonnars derived (I believe)
from the older 50/2 Sonnar.  These last two have a lot less in common with
historic design.

Dante

on 7/24/02 5:08 AM, D Khong at dkhong@pacific.net.sg wrote:

> 
> 
> Friends
> 
> Do all sonnar lenses (like in Rollei 35S, Contax T, Contax G 90/2.8, etc)
> have the same optical formula?
> 
> Dan K.
> 
> 
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- ------------
Dante Stella
http://www.dantestella.com

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