Bower SFD14C Canon E-TTL I/II  Macro Ring Flash Bounce and swivel zoom head allows versatile reflection for difficult lighting conditions Guide Number: 46 feet (50mm @ ISO 100) For Macro, Medical and Hobby Photography Compatible with all Canon EOS models including: 1D/1Ds, 5D, 7D, 50D, 60D, T1i, T2i, T3/3i, XSi, XS, XT/Ti, 300D, 400D, 450D, 1000D EV exposure control that synchs with Canon EOS SLR cameras