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[OM] Zoom lens test

Subject: [OM] Zoom lens test
From: Richard Schätzl <Richard.Schaetzl@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 02 Apr 1998 15:47:49 +0100
Hello Olympians,

here are an lenstest of AF zooms. As far as I know,  
the Olympus AF lens has the same lens design than the MF Zuiko.
Interesting is one remark of the author, they said, that Olympus 
wanted to introduce a new designed AF lens to replace the tested one.

Based on a lens test by the Magazin Color Foto, published in 9/91.



Lens Sharpness               Contrast              Distortion  Vignetting
                                                                in stops
     Center  Corner   Total  Center Corner  Total                 

Olympus Zuiko AF Zoom 3,5-4,5 35-105mm at 35mm
3,5    7,4     5,1     6,7    8,5     5,7    7,6    barrel,      1,1
5,6    7,9     6,0     7,3    9,0     7,6    8,5    strong       
8,0                                                              0,8
Olympus Zuiko AF Zoom 3,5-4,5 35-105mm at 50mm
3,8    7,5     5,2     6,7    8,3     6,0    7,5   pincushion,   0,7
5,6    8,2     6,8     7,7    9,0     7,7    8,6    obvious to      
8,0                                                  strong      0,3
Olympus Zuiko AF Zoom 3,5-4,5 35-105mm at 105mm
4,5    7,4     4,9     6,6    8,1     5,7    7,3   pincushion    0,7
5,6    7,8     6,0     7,2    8,9     7,0    8,3   strong to      
8,0                                                very strong   0,2
Nikon AF-Nikkor 3,5-4,5 35-105mm at 35mm
3,5    7,9     6,3     6,7    8,9     6,9    8,2   waveform,     1,2
5,6    8,9     6,9     8,2    9,2     7,9    8,3    obvious       
8,0                                                              0,5
Nikon AF-Nikkor 3,5-4,5 35-105mm at 50mm
3,8    7,6     6,5     7,2    8,4     6,7    7,8   pincushion,   0,8
5,6    8,5     6,9     8,0    9,0     8,0    8,7    obvious       
8,0                                                              0,5
Nikon AF-Nikkor 3,5-4,5 35-105mm at 105mm
4,5    7,4     6,1     7,0    8,3     6,2    7,6   pincushion,   0,7
5,6    8,0     6,7     7,6    9,0     7,2    8,4    obvious       
8,0                                                              0,3


The quality numbers are basing on MTF measuring, the difference of 
one whole number marks an, for the critical observer, just noticeable 
difference in sharpness, contrast. The maximum number is 10, which stands  
for a flawless lens.
The number are computed and weighted for the central half diameter 
to 2/3 and the rest to 1/3, the extreme corners are not rated.
Vignetting is the combined effect of light fall off and vignetting 
through the lens barrel. It?s measured at 18mm.
Waveform distortion is a combination of pincushion distortion in the 
corner and barrel distortion in the center.

Richard



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