1950s Voightlander lenses, are they prone to balsam seperation?

[Hamster]

I have recently purchase a 100mm Dynaret for my Vitessa T on the auction site, this was meant to be a replacement for the same lens I already have the has separation in the rear group. The lens came in with separation also, seller refunded but I'm still trying to find a good copy.

I have also heard that 50mm Septon are also prone to separation, is it a known 1950s Voightlander issue? Are their Tessa type Color-Skopar also iron to this, I would be devastated it it happens to my Perkeo II and Vito B.

On a side know every optical diagram I saw for the 100mm Dynaret shows no cemented rear group, so maybe there's multiple versions?

 

[titrisol]

Not the Skopars or the Ultrons AFAIK

 

[Dan Fromm]

Not the Skopars or the Ultrons AFAIK

ApoSkopars (heliar type process and copying lenses, their name notwithstanding), yes, alas.

 

[blee1996]

I seems relatively common: one of my Septon 50/2 for Bessamtic has severe separation, my previous Nokton 50/1.5 has small amount of edge separation.

But I think it is not limited to Voigtlander. Zeiss lenses from the same era also have similar issues: e.g. my previous Sonnar 85/2 for Contarex system.