Archived posting to the Leica Users Group, 1996/10/18

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Subject: Re: 35mm Asph./ASPHERICAL
From: captyng@vtx.ch (Gerard Captijn)
Date: Fri, 18 Oct 1996 10:50:24 +0200

A french photo magazine called "Chasseur d'Images" (hunter of images)
published a test covering the old (2 asperic surfaces) and new (1 aspheric
surface) Summilux-M 35mm f/1,4.

Although I am not sure what they are measuring exactly (contrast?, resolution?,
a combination of both?) here are the results.

                                Summilux-M 35 mm f/1,4
           old (2 aspheric surfaces)            new (1 aspheric surface)
- -----------------------------------------------------------------------------
           center              corners                 center           corners
- -----------------------------------------------------------------------------
1.4      good               average                 good-           average  
2.0      very good       average/good         very good-    good-
2.8      very good +    good+                   very good+   good+
4.0      excellent         very good              excellent       very good-
5.6      excellent+       very good+            excellent       very good
8.0      excellent         very good              excellent-      very good+
- ----------------------------------------------------------------------------
- -    
The conclusion would be that the old Summilux is very slightly superior to the
new one, the differences being only visible under optimum conditions during
picture taking and viewing plus the best film/developer.

Chasseur d'Images are of the opinion that the lens is somewhat expensive,
which earns them the price for the understatement of the year.

Hope that this is somehow useful.

Gerard Captijn,
Geneva, Switzerland.                    
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