Original BIOPTRON Compact III to Bioptron YouTHron/Medall
Interface Adapter
Quickly adapt your new style Bioptron YouTHron/Medall filters
to fit your original Bioptron Compact III
OR

Use your original Zepter Bioptron Compact III lenses on your
new Bioptron YouTHron/Medall.

This is the authentic product that comes from the Zepter/Bioptron factory