Sigma 62mm Adapter Ring for EM-140 DG Macro Ring Flash at KEH Camera
Amazon.com : Vivitar 6000AF TTL Auto Focus Macro Ring Flash for Nikon, Canon, Pentax & Minolta Cameras : On Camera Macro And Ringlight Flashes : Electronics
Sigma Electronic Ring Flash Macro EM-140 DG – Phototek Canada
Sigma introduces 70mm F2.8, first Art series macro: Digital Photography Review