A:Answer like ANY rangefinder camera, the problem you will have with a polarizer is that the view through the rangefinder window is NOT what the lens will see through the polarizer. Of course, the electronic view will show exactly what the lens 'Sees" through the polarizer, so with that limitation, YES, you can use a polarizer on the fuji film x100f, but ONLY in electronic view mode. The filter you need is a 48mm (CRAZY!) or, better, get a step-up adapter with a lens hood and use the 49mm outside thread for a 49mm (common size) polarizer.