The Olympus FL-50R TTL Shoe Mount Flash is a fully-featured and powerful shoe mount flash that also offers wireless flash operation. Control is possible directly from the camera without the need for cables. This flash unit is the ideal accompaniment to the Olympus E-3, which features a newly-developed RC Data Transfer System that transmits data optically. This significantly reduces the power consumption of the built-in flash when being used as the system commander. Flash control is available in three groups, allowing flash mode and compensation settings to be set independently for each group - thus enabling ultra-precise illumination. Four remote control communication channels can be set by the user to avoid interference with other peripherals in the vicinity.