Multiplies focal length of mounted lenses by 1.4x. Weather-resistant design for weather- and dust-resistance and operation as low as 14 Degree. AF speed equivalent to XF lens by itself is still achieved with the tele converter. Camera displays and records information reflecting the change in aperture and focal length when the tele converter is mounted. Currently compatible with XF50-140mm, XF100-400mm & XF80mm