Use your Pentax-K mount lenses with your FujiFilm X camera. Reaching their height of popularity in the late '70s through the '80s, a wide variety of Pentax-K glass is available around the world.
From the manufacturer:
Allows Pentax K-mount lenses to fit on Fujifilm X-mount camera bodies; for Fujifilm X-Pro 1 X-E1 X-M1 and later cameras. There are no electrical contacts in the adapter ring. Exposure and focus must be adjusted manually; Autofocus (AF) is not available. This fabulous adapter can enable the camera owners to increase the cameras' magnification and working distance. With precise design and high technology. Made of brass and anodized aluminum. Install, remove and operate lens smoothly. 100% Satisfaction Guaranteed.