Ray Flash Ringflash Adapter for Canon 580EX II Flash with Canon 1V/1Ds/1D DSLR Cameras Ray Flash: The Ring Flash Adapter Ring Flash for Canon and Nikon Portable Flash Units The unique Ray Flash is designed to replicate the lighting effect produced by heavy, tethered, powered studio ring flash units It's light, it's portable, and it requires no power other than your Nikon or Canon flash unit Uses Canon/Nikon hot shoe flash