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Re: [OM] Zuiko lens contrast

Subject: Re: [OM] Zuiko lens contrast
From: Richard Schätzl <Richard.Schaetzl@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 16 Mar 1998 21:08:28 +0100
Ulf Westerberg wrote:

> Many commented that they had never ever seen so sharp, contrasty and colourful
> slides before. Eventually she became a little embarrassed about it all as
> questions about her equipment never seemed to stop, and it turned out she
> had swapped all of it for "something more modern".
> 
> What had she used, then? OM-4, lenses 300/4.5, 180/2.8 and 90/2 on
> Kodachrome 64. (Don't know about filters).

Another fine example of good Olympus glass and now the numbers:

Lens test of macro lenses made by the German magazin Color Foto, 
published in 1/88,2/88.
The graphs, of this test, are missing here for obvious reasons.
The quality numbers are basing on MTF measuring, the difference of one
whole number marks an, for the critical observer, just noticable difference in 
sharpnes, contrast. The maximum number is 10, which stands for a flawless lens.
The number are computed and weigthed for the central half diameter to
2/3 and the rest to 1/3, the extrem corners are not rated.

Lens            Sharpness               Contrast                Trans-  Vignet-
                                                                mission ting 
                Center  Corner  Total   Center  Corner  Total   in %    in 
stops         

Olympus Zuiko Auto-Macro 90mm 2,0
2,0 1:2         7,8     7,6     7,8     8,0     7,8     7,9                     
 
2,0 infinity    8,9     8,6     8,8     9,1     8,8     9,0     94      1,2 
5,6 1:2         8,5     8,2     8,4     8,6     8,4     8,5             (0,5 at 
2,8)    
5,6 infinity    9,5     9,2     9,4     9,6     9,4     9,5             0
Zeiss Macro Planar 100mm 2,8
2,8 1:1         7,3     7,4     7,3     9,0     9,0     9,0                     
 
2,8 infinity    8,4     8,4     8,4     9,0     9,0     9,0     95,4    1,0
5,6 1:1         8,2     8,2     8,2     9,5     9,5     9,5                     
 
5,6 infinity    9,2     9,1     9,2     9,5     9,5     9,5              0
Leitz APO-Elmarit-R 100mm 2,8
2,8 1:2         8,0     7,9     8,0     8,4     8,0     8,3                     
 
2,8 infinity    8,6     8,6     8,6     9,0     9,2     9,1     95,8    0,6
5,6 1:2         8,5     8,5     8,5     8,9     8,8     8,9                     
 
5,6 infinity    10 !    9,5     9,8     9,5     9,5     9,5              0
Nikon Micro Nikkor 105mm 2,8
2,8 1:2         6,8     6,3     6,6     7,1     6,6     6,9                     
 
2,8 infinity    7,8     7,2     7,6     8,1     7,6     7,9     90,3    0,9
5,6 1:2         7,9     7,4     7,7     8,2     7,9     8,1                     
 
5,6 infinity    8,8     8,4     8,6     9,1     8,8     9,0             0
Minolta AF-Macro 100mm 2,8
2,8 1:1         6,9     7,1     7,0     7,3     7,5     7,4                     
 
2,8 infinity    8,2     8,4     8,3     8,6     8,7     8,6     93,8    0,9
5,6 1:1         7,9     7,3     7,7     8,4     7,9     8,2                     
 
5,6 infinity    9,6     8,7     9,3     9,7     8,9     9,4             0
Tokina ATX Macro 90mm 2,5
2,5 1:2         7,8     6,7     7,4     8,0     6,8     7,6                     
 
2,5 infinity    8,7     7,7     8,3     8,9     7,8     8,5     90,3    0,8
5,6 1:2         8,7     8,6     8,7     8,5     8,4     8,5                     
 
5,6 infinity    9,6     9,6     9,6     9,4     9,4     9,4             0
Tamron Tele Macro 90mm 2,5
2,5 1:2         7,3     7,3     7,3     7,6     7,3     7,5                     
 
2,5 infinity    8,2     8,2     8,2     8,6     8,4     8,5     93,1    0,9
5,6 1:2         8,6     8,1     8,4     8,9     8,2     8,7                     
 
5,6 infinity    9,5     9,0     9,3     9,6     9,2     9,5             0,1
Vivitar Macro Telephoto 100mm 2,8
2,8 1:1         5,7     5,1     5,5     6,5     5,3     6,1      
2,8 infinity    6,8     6,2     6,6     7,6     6,4     7,2     90,1    1,0
5,6 1:1         7,5     6,6     7,2     8,0     7,5     7,8      
5,6 infinity    8,6     7,5     8,2     9,1     8,3     8,8             0,2

Remarkeble is the high performance of the fast Zuiko compared 
with the slower Zeiss and Leitz lenses. Zeiss and Leitz have a 
better contrast than the average lenses, it´s a pitty, that I 
have no numbers for the Zuiko at 2,8 , I would expect an rise in 
contrast for it. What too, distingish this group of three, from 
the rest of the tested lenses is the high transmission of light 
through the lens. The APO Leitz is a real APO lens (not "Sigma APO 
everything"), that means, you don´t need focus correction for infrared.
This test shows, that the fame of Olympus macro lenses has reasons.

Richard

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