K&F Concept Lens Mount Adapter Ring M42 42mm Screw to Fuji Fujifilm FX XPro1 X-Pro1 camera Premium-grade K&F Concept adapter,high precision,good quality. Made of brass and aluminum (not plastic), anodized aluminum construction. Smooth surface for effortless mount,infinity focus allowed, diaphragm control of the lens is set manually. Compatible Cameras (Including, but not limited to):Fuji X-Pro1, X-E1, X-M1, X-A1, X-E2, X-T1. Please note: 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.