CONTAX 28-85 3.3/4 Zeiss Vario-Sonnar T* MM


Vario-Sonnar 28-85f/3.3-4

MTF from www.zeiss.de

--------------------------------------------------------------
CONTAX 28-85 3.3/4 Zeiss Vario-Sonnar T* MM
--------------------------------------------------------------
Lens/groups: 16/13
Minimum focus: 0.6 m
Angular field: 72°-29°
Filter: 82 mm
Size: 85 x 99.5 mm
Weight: 735 g
Year: 1989

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Focal lenght= 29 mm                          
                        
Aperture     Real       -------  MTF  -------    
setting(#)   aperture     Center(*)    Border(*)   Average(*)
--------------------------------------------------------------
   3.3        -.1           8.3          7.8         8.0
   5.6        +.2           8.7          6.8         8.0
    8         +.3           8.6          7.0         8.0
   11         +.3           7.8          6.8         7.4
   16         +.3           7.8          6.8         7.4
   22         +.3           7.0          6.0         6.7

(#) =La fabbrica dichiara un'apertura variabile al crescere della focale
(*) =(3=poor, 5=sufficient, 7=good, 9=excellent)
Average= region between center and border, not maths average
--------------------------------------------------------------
Distortion: -3.0 % (barrel)
Vignetting: 0.25

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Focal lenght= 34 mm                          
                        
Aperture     Real       -------  MTF  -------    
setting(#)   aperture     Center(*)    Border(*)   Average(*)
--------------------------------------------------------------
   3.3        -.1           8.2          7.6         8.0
   5.6        +.2           8.7          6.8         8.0
    8         +.3           8.6          7.0         8.0
    11        +.3           8.3          6.1         7.8
    16        +.3           7.8          6.8         7.4
    22        +.3           7.0          6.0         6.7

--------------------------------------------------------------
Distortion: -2.0 % (barrel)
Vignetting: 0.25

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Focal lenght= 40 mm                          
                        
Aperture     Real       -------  MTF  -------    
setting(#)   aperture     Center(*)    Border(*)   Average(*)
--------------------------------------------------------------
   3.3        -.2           8.1          7.8         8.0
   5.6        +.2           8.4          8.0         8.2
    8         +.2           8.3          8.1         8.2
   11         +.2           8.1          7.8         8.0
   16         +.2           7.6          7.4         7.5
   22         +.3           6.8          6.6         6.7

--------------------------------------------------------------
Distortion: -1.0 % (barrel)
Vignetting: 0.2

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Focal lenght= 52 mm                          
                        
Aperture     Real       -------  MTF  -------    
setting(#)   aperture     Center(*)    Border(*)   Average(*)
--------------------------------------------------------------
   4.5        -.5           7.8          7.0         7.6
   3.3        -.3           8.0          7.9         8.0
   5.6        +.1           8.4          7.9         8.1
    8         +.1           8.3          8.0         8.1
   11         +.1           8.0          7.8         7.9
   16         +.1           7.5          7.4         7.5
   22         +.2           6.8          6.6         6.7

(#) =La fabbrica dichiara un'apertura variabile al crescere della focale
(*) =(3=poor, 5=sufficient, 7=good, 9=excellent)
--------------------------------------------------------------
Distortion: + 1.0 % (cushion)
Vignetting: 0.2

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Focal lenght= 81 mm                          
                        
Aperture     Real       -------  MTF  -------    
setting(#)   aperture     Center(*)    Border(*)   Average(*)
--------------------------------------------------------------
   4.5        -.9           7.9          6.6         7.6
   3.3        -.5           8.8          7.6         7.9
   5.6        -.2           8.3          7.6         7.9
   8          -.1           8.4          8.0         8.2
   11         -.1           8.0          7.9         8.0
   16         -.1           7.8          7.4         7.4
   22         -.1           6.7          6.5         6.5

--------------------------------------------------------------
Distortion: + 2.0 % (cushion)
Vignetting: 0.4
--------------------------------------------------------------
 

For a good print download this page in PDF File in PDF format

La qualità è sicuramente straordinaria. E' un ottica eccellente che copre una ampia gamma di focali (3X) senza il minimo compromesso della resa qualitativa. Alla massima apertura abbiamo sempre una resa altissima e una incredibile uniformità tra centro e bordi.
La distorsione è avverbile solo a 29 mm (3%) ma è più che accettabile, le altre focali sono ben corrette. Anche la vignettatura è straordinariamente contenuta, anche al particolare disegno della parte frontale del barilotto.
Sicuramente uno dei migliori zoom mai prodotti.
nbsp;

Ritorna all'indice Contax-Zeiss
 

Per commenti e informazioni contatta il prode a: ilprode@yahoo.com

Questa pagina è stata visitata  volte dal 17/10/99