The MCEX11 is a 11mm macro extension tube designed exclusively for Fuji XF lenses and X-series cameras. When inserted between the lens and the camera body it increase the distance between the lens elements and the sensor, enabling users to focus on subjects much closer to the camera. Electronic connections automatically pass information between Fujinon X-Mount lenses and Fujifilm X-series camera bodies so you can still use autofocus and control the aperture while using the tubes.
PLEASE REFER to the Working Distance Table for the shortest shooting distance (distance from the sensor to the subject) of each of the current X mount lenses with and without the tubes attached. Note that some tubes do not work with some lenses, as indicated by the grey boxes. The shooting distance and shooting magnification change according to the position of the focusing lens group. The table shows reference values for when the focusing lens group is in the position to shoot the closest object.