I bought recently some flash stuff for my EOS system, and one of them was the Off-Camera Shoe Cord OC-E3 which is notoriously expensive piece of wire. When I got my Speedlite transmitter to my Canon this became pretty much obsolete, so I tried it to my Fujifilm X100 and the cheapo EF-20 flashy and it works! This will stay in my bag with X100.