The FL-50R is an external flash unit that allows wireless* flash settings to be controlled from the camera body. Wireless flash transmission channel settings enable selection of flash/no flash for groups of multiple flash units. In addition it allows TTL auto, auto, and manual modes to be set; offers a bounce and swivel head; and flash coverage is automatically adjusted in several steps to correspond to the image area when zooming. The FL-50 provides GN28 at a 12mm focal length (equivalent to 24mm on a 35mm camera; ISO 100) and GN50 at 42mm focal length (equivalent to 85mm on a 35mm camera; ISO 100).(* The E3 is the only camera compatible with the Olympus Wireless RC Flash System as of October 2007. The traditional clip-on flash system is usable with any camera model.)Wireless multi-flash photography capability when used with the E-3* Rotary head can be rotated in four directions. The guide number is as high as 28 at 12mm (equivalent to 24mm with 35mm camera) and 50 at 42mm (equivalent to 84mm with 35mm camera), when the ISO is 100 TTL Auto, Auto, Manual, FP TTL Auto, FP Manual modes FP Modes permits flash synchronisation up to 1/4000s with the E-1, E-300, E-330, E-500, E-410, E-510, E-3 models Slide-out ultra-wide angle diffuser for flash coverage at an 8mm focal length (equivalent to 16mm on a 35mm camera) AF illuminator for low-light focus assist up to 10m Red-eye reduction, slow synchronisation and second curtain synchronisation Manual flash power can be set to FULL, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, & 1/128Flash coverage automatically adjusts to correspond with focal length of lens used * The E3 is the only camera compatible with the Olympus Wireless RC Flash System as of October 2007. The traditional clip-on flash system is usable with any camera model.