The Fujifilm FUJI EF-20 has been crafted to work perfectly with the Fujifilm FinePix X100, along with other Fujifilm FinePix cameras such as the HS20EXR or HS10. It can be used on the X100 and HS20 automatically with TTL, however some other Fujifilm cameras may require the camera to be on manual settings to fire the flash. Taking only two AA batteries and weighing only 100 grams (excl batteries), it is a light and quite fast flash with a fast recycle time.
Make sure you get some batteries for your new flash! This flash requires 2 AA batteries. We recommend Sanyo Eneloop batteries.