The Vizelex ND Throttle Lens Mount Adapter from FotodioX allows you to use your Canon FD (New FD, FL) lens on the Fujifilm X-Series mirrorless camera (lens/camera not included). The adapter features a built-in ten-stop variable ND filter which lets you control the amount of light coming in through the lens with a quick twist of the integrated blue dial. This filter comes handy when you're shooting video, as you are able to shoot in bright daylight with a shallow depth of field. The filter also allows you to move from bright to dim locations and adjust the light on the fly via the adapter.

The leaf spring design in the adapter holds the lens tightly to the camera body; ensuring there is no play between the camera and the lens. The all metal design and polished surface is designed for smooth mounting. Although the lens will fit physically, automatic diaphragm, auto-focusing, and other functions will not operate correctly while using this adapter. Because of this, you need to use the stop-down mode when metering since the lens does not have the ability to have its aperture controlled by the camera body. You can shoot with manual mode or aperture priority mode. Infinity focusing is ensured.