Olympus Ring type and macro flash for Close-up Photography - Ring and macro flash units are often closely associated with "shadowless, even illuminations.." flash effects and it is indeed very useful for those who often engages in closeup photography or shooting pictures in studio such as duplicating works.
Olympus' macro flash units are separeted in either Ring type flash or macro flash setup. Both types of flash usually comprised of a T Power Control unit which attaches to the accessory shoe of the camera.