Collapsible 50mm for Bessa R?

I have never collapsed any collapsible lens. I get such lenses for the optics and not for reduced length when collapsed.
 
Antique thread revived, but where are some other RFF threads after this one came with updated info.
Since 2006 it was discovered what Industar-10 is collapsible into Bessa R and Leicas. But better to have rubber band added under front flange of the lens. With I-22 and I-50 even more needs to be added because I-22 and I-50 have longer tubes, while I-10 is copy of Elmar (in construction).

Collapsible Industar on Leica IIf. Best compact, pocketable, metal, fully mechanical kit I ever have.
 
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