Coco Ring Flash Adapter for Canon 580EX II Flash with Canon EOS 1Ds Mark III, 1D Mark IV, 1D Mark III, 1Ds, 1Ds Mark II, 1Ds Mark N, 1D Mark II & 1D Digital SLR Cameras Designed to replicate the lighting effect produced by heavy, expensive ring flashes. Light & Portable Requires no power Very low price