Flange 17.7 mm · APS-C 1.5×
Fujifilm announced the X mount in January 2012 with the X-Pro1, and every X-mount camera since has an APS-C sensor. The 17.7mm flange leaves room for adapters from nearly every SLR mount, and Fujifilm builds a Mount Adaptor Setting into its cameras for recording and correcting adapted lenses. Don't confuse it with the Fujica X bayonet on Fuji's 1970s film SLRs, which is a different mount.