The Sony HVL-RLAM is not a Ringflash in the true sense of the word as it uses LED technology rather than a flash tube. Designed specifically for use with Sony digital SLR's the output can be controlled using either the left or right side of the unit or the whole area. Ideal for close-up or macro work with an effective working distance of between 0.1 and 0.5m and an output of 150lux at 0.3m. Powered by 4 AA batteries and supplied with 49mm and 55mm adapter rings.
Seems like this is over the £250 price everywhere else..Not sure if the light is any good myself but I am tempted to get it for my Sony A700 setup.