Thank you for viewing. This is an ARRIFLEX Standard (ARRI-S) mount to Micro Four Thirds conversion mount adapter. ARRI-S (Arriflex Standard) is a traditional mount standard for 16mm film cameras, including the ARRIFLEX 16 series. Many legendary lenses in film history, such as Cooke, Angenieux, and Schneider, are available in this mount. By using this adapter, you can use these ARRI-S mount cine lenses with Micro Four Thirds cameras (BMPCC, GH series, etc.). Please check the condition of the product in the photos. Please consider this item, understanding that it is a used product.