Made of black anodized aluminum (camera body mount) and brass silver (lens mount) the KIWIFOTOS LMA-PK_NK mount adapter allows the use of Pentax K-Mount lens on NIKON DSLR camera. The mount adapter is built with multi-coated optical glass. The lens fits physically, automatic diaphragm, auto focusing, or any other functions will not operate correctly, however. Preserve all focusing range up to the infinity point.