| Praktica
  FX, service version | 
| Producer data | 
| Producer | 
VEB Kamera-Werke Niedersedlitz | 
responsible constructor | 
Siegfried Böhm | 
| production period | 
Oktober 1956 to June 1957 | 
no of produced cameras | 
approx. 300 | 
| Technical properties of the camera | 
| shutter type | 
mechanically controlled horizontal-run
  rubberised cloth-blind type shutter with twin settings for fast and slow
  speeds | 
exposure time 
(possible settings) | 
B, 1/2, 1/5, 1/10, 1/25, 1/50, 1/100,
  1/200,1/500 | 
| view finder | 
interchangeable
  view finder (Pentaprism, waist-level finder) with fixed condenser type ground-glass focusing screen,
  simple sport view finder | 
mirror | 
no instant-return mirror | 
| film transport / frame counter | 
knob film advance, loose film take-up
  spool (metal), manual frame
  counter | 
lens mount | 
M42x1 | 
| self timer | 
none | 
battery | 
none | 
| metering system | 
none | 
flash system | 
X- and F-synchronisation with
  two flash coaxial sockets at the front of the camera body | 
| flash indication | 
none | 
aperture reflection into view finder | 
none | 
| general comments | 
  
      | service version of Praktica FX, third variation (Hummel 129) only
      with modified interchangable view finder system and modified camera bag,
      but without self timer (original Hummel 131) |  
      | Prism Carl Zeiss Jena No. 37711 |  
   
 | 
| collection data | 
| Hummel-No | 
131A | 
Kadlubek-No. | 
none | 
| body no. | 
142505 | 
lens no. | 
3883973 | 
| lens type | 
Carl Zeiss Jena Tessar 2.8/50
  T | 
purchase price | 
55€ | 
| advertising | 
     
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manual | 
    
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