A Short History of Fast Normal Lenses

Wondering where the Zeiss 50mm f1.8 Ultron (7 elements, 6 groups, concave front element) fits into this genealogy? Extended Ultron? Hope Roland is still around.

According to this it was developed by AW Tronnier and is based on the Double Gauss design. It is called an Ultron. so that implies it is an evolution of that line.
 
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