The Fujifilm EF-20 TTL Flash combines a compact design & efficient controls meaning it is ideal for carrying in your pocket or bag to provide any additional lighting. The hotshoe folds cleverly into the flash body to minimise space & simply rotates out when required for use. The guide number 20 (ISO 100-m) & operating TTL with the X100/X10 & HS20EXR cameras, the EF-20 provides superb lighting for each shot. The EF-20 has a built in wide panel diffuser which provides effective flash distribution while EV adjustment can be made up +/-1.0EV in 5 steps (-1, -0.5, 0, +0.5, +1). It is powered by 2 AA batteries with a quick charge time of Approx. 4 seconds.