Specs for "50mm" lenses on Voiglander Prominent

[sychan]

Does anyone know what the actual focal length is on the Nokton and Ultron lenses for the old Voigtlander Prominent?

 

[Biggles]

According to my old Voigtlander Prominent manual, both the f2 Ultron and the f1.5 Nokton were 50mm lenses. Does that help?

Or were you asking for actual measurements from point A to point B?