Key Features of the FujiFilm - EF-60 TTL Flash. FujiFilm EF-60 also features optical wireless mode. TTL mode automatically calculates the optimum exposure. The EF-60 has a maximum Guide Number of 60 (ISO100・m and flash coverage setting at 200mm 1) despite its compactness and the head be adjusted by 90 degrees upward or by 180 degrees either left or right so that flashlight can be bounced off a wall or ceiling to imitate natural light and avoid harsh shadows.