Here I look at the Fuji EF-42 and the Fuji EF-X20 options.
The Fujifilm EF-X20 Flash was designed for the X-PRO1 Digital Camera. A switch lets you choose between two modes: Auto, which automatically optimizes the flash for daylight indoor and outdoor shots in low light, and Manual for manual control. The Fujifilm EF-X20 is a compact flash with a guide number of 66 and allows Manual power output adjustment in 6 steps from full power to 1/32 or TTL flash compensation in 1/3 stop increments.
The EF42 allows reference by different values, the focal length display can be switched between the digital display (APS-C) and the 35-mm film size converted display on the LCD while the wide range of functions and user-friendly controls make the EF-42 easy to use. The guide number of 24 to 42 changes automatically to the lens focal length while the flash will also zoom automatically between 24mm and 105mm (up to 20mm with the wide panel). Allowing full manual control, the EV can be adjusted in 7 steps (-1.5, -1, -0.5, 0, +0.5, +1, +1.5) while the power ratio can be adjusted in 7 steps (FULL,1/2,1/4,1/8,1/16,1/32,1/64). When shooting in the dark or dimly lit places, the near infrared assist light is automatically illuminated to enable automatic focusing.
See on youtube.com