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Ultron is the name of a lens designed by Voigtlander, and later Zeiss. The name is used by the Cosina Voigtländer lenses currently.

The original "Ultron" was a 50mm f/2.0 lens with 6 elements in 5 groups designed for the Voigtlander Prominent camera and introduced ca 1950. It was designed by A.W. Tronnier [1] as an improvement on his own Schneider-Kreuznach Xenon (c.a. 1937) design. Ultron lenses were also used in the Vitessa cameras, Vito III, Vitomatic and others as a high end option over the Skopar.

When Zeiss took over Voigtlander a further design improvement by Tronnier resulted in the Ultron 50mm f/1.8 used in the Icarex camera and also available in M42 mount (as Color-Ultron). This lens had an extra concave front element making it a 7 elements in 6 groups lens [2]

Cosina Voigtlander

The name Ultron was reused in the early 2000 by Cosina Voigtlander[3]

  • 40mm f/2.0 Aspherical lens, a 6 element in 5 groups lens for SLRs.
  • 35mm f/2.0, 35mm f/1.7, 28mm f/2.8 and Macro Ultron 35mm 1:2 for rangefinders and mirrorless cameras

Other makers

Other makers adopted lens formulas similar to the Ultron for their fast 50s, such as:


  1. Patent for the Ultron lens as filed in the US
  2. Early fast lenses at www.klassik-cameras.de by Frank Mechelhoff
  3. Cosina Voigtlander official page