Unomat 20B

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Unomat 20B is a small electronic flash made by West German company Unomat GmbH & Co. KG from 1980s to 2000s.

The 20B is a compact unit powered by two AA (R6) size cells, with guide number of 20 m for 100 ISO speed. A hot shoe is provided for flash sync and a detachable PC cord can be connected by a standard micro jack socket at the body side.
Two versions of the flash were available - the basic Unomat 20B, manual variant with full pover flashes only, and the Unomat 20B Auto - the latter equipped with automatic exposure control (2 auto stops - 1:2.8 and 1:4 for 100 ISO, corresponding to 7.1 m and 5 m automatic ranges respectively). The automatic circuit is of a simple, not thyristor type (the capacitor has to be fully recharged after each flash) and no auto check signal is provided.


  • Guide number: 20 m
  • Flash energy: 19 Ws
  • Flash duration: approx. 1/1000 s
  • Colour temperature: approx. 5600 K
  • Angle of illumination: approx. 60 deg.
  • Auto stops: 2 (20B Auto only)
  • Power source: 2x AA
  • Charging time: 8 s
  • Dimensions: 82x62x42 mm
  • Weight: 250 g


  • Unomat 20B / 20B Auto instruction manual.