The Cobra Macroflash Automatic Ring Light is a convenient and creative lighting solution for medical, dental, flower, insect, jewelry, coin, and other small subject close-up photography where built-in and conventional flashes are impossible to use. The circular flash tube design encompasses your lens to provide shadow-free, even illumination on your subject. A PC cord and Hotshoe-to-PC adapter are supplied, enabling the Macroflash to be used with almost any Digital or 35mm Film SLR Camera with a hotshoe or standard PC socket.