Quantum Qflash TTL Adapter for Canon Cameras (D23WR) Mounts on camera's hot shoe Provides TTL information to Quantum Qflash Dial to adjust output. Quantum Qflash T or X Series & Canon, EOS 1D Mark II,EOS 1D Mark III,EOS 1D Mark IV,EOS 1DS,EOS 1Ds Mark II,EOS 1Ds Mark III,EOS 40D, EOS 50D,EOS 5D,EOS 5D Mark II,EOS 5D Mark III,EOS 60D,EOS 700,EOS 750,EOS 7D,Rebel S,REBEL Xsi,REBEL XT 350D,REBEL XTi