There are two things about Fujinon lenses. They don't have an A/M switch, the lens needs to be in manual to be able the stop down. You either need an adapter that also pushes the aperture pin or disable it altogether( I did on mine by pushing it in with a sharp object until it snapped). Also there is a tab on the outside of the mount of the lens, which is needed for open aperture metering on Fujica bodies. Useless on any modern camera. You need to file of the tab or you need a specific adapter that accommodates the tab. More info here:
Converting Fujinon lenses to manual aperture | M42 Fujinon lenses | Flickr