The Fujifilm EF-42 Flash features a guide number of 138′ at ISO 100 and 105mm and is fully compatible with Fujifilm cameras, offering TTL flash metering support. The flash head itself has a zoom range from 24-105mm with full-frame cameras which can be extended down to 20mm with a wide-angle panel. Also, bounce flash is possible with tilting upward 90° and rotation 120° right and 180° left, for full control over light placement.
The flash offers full manual controls if desired from 1/1 to 1/64 power as well as exposure compensation from -1.5 to +1.5 EV in 1/2 EV steps. Also, the front of the unit has an AF assist light and it has a recycle time of 3 to 3.5 seconds at full power. It runs on 4 AA batteries.