Opteka

Opteka 500mm f/8 High Definition Telephoto Mirror Lens for Canon EOS 7D, 6D, 5D, 1DX, 70D, 60D, 50D, 40D, T5i, T5, T4i, T3i, T3, T2i and SL1 Digital SLR Cameras,Opteka T-Mount Adapter for Canon EOS 70D, 60D, 50D, 40D, 30D, 20D, 7D, 6D, 5D, 1D, Rebel T5i, T5, T4i, T3i, T3, T2i, T1i, XS, XSi, XTi Opteka High Definition 2X Telephoto Converter for Opteka 650-1300mm, 500mm and 800mm SLR Lenses

and XT Digital SLR Cameras,