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.
