K&F Concept Pentax PK lens to Fujifilm Fuji FX Mount Camera Adapter. fits X-Pro1 X-E1 X-M1 Allows Pentax PK lens to be used on FX X-Pro1 X-E1 X-M1 camera body. Diaphragm control of the lens is set manually. With precise design and high technology,made of brass and aluminum (not plastic). There are no electrical contacts in the adapter ring,exposure and focus has to be adjusted manually. Please note: the adapter ring is not suitable for X-H1 camera. Infinity focus positionthe position of the infinity mark of the telephoto lens or super telephoto lens is shifted slightly to the positive side to enable focus adjustment even when focus shift is caused due to temperature changes.The shift range is denoted by an L-shaped line, Be sure to check the focus through the viewfinder even when you shoot at infinity.