feature :It is designed for close up, macro, medical, scientific and forensic photography as the flash light source is positioned directly between the camera lens and subject providing an even illumination.Full innovation Led technology.More approach natural light use high quality led light.There are seven levels luminanceIt is meets the higher photography needs under the innovation functionLeft and right flash function make the object appeared third dimensionFit for macro shot, scientific research, medical and personal hobbies of photography.Mount the flash product on the lenses.1. Attached are equipped with52mm, 55mm, 58mm,62mm, 67mm, 72mm 77mm, seven different adapter ring.2. Press the annular light lock and place on the lens with adapter ring, loosen lock button, when annular light have locked in the adapter ring already.Four working mode:Light mode,Flash mode,L mode(Left half of the annular flash),R mode(right half of the annular flash).