Ultron

Ultron is the name of a lens designed by Voigtlander, and later Zeiss. The name has also been used by the Cosina Voigtlander lenses.

The original "Ultron" was a 50mm f/2.0 lens with 6 elements in 5 groups designed for the Voigtlander Prominent camera. It was designed by A.W. Tronnier as an improvement on his own Xenar (c.a. 1937) design.

When Zeiss took over Voigtlander a futher desing improvement by Tronnier resulted in the 50mm f/1.8 used in the [[Icarex] camera. This lens had an extra concave front element.