This is a demonstration store. You can purchase products like this from Leica Store Miami.
This Leica filter adapter is a 60mm to 82mm step-up ring that makes it possible to mount Leica E82 filters on the Noctilux-M lens. Since this adapter ring features a hollowed out core, viewing through the rangefinder is still possible. Using the adapter allows for polarizing effect to be judged directly through the viewfinder.