Opteka 2X Manual Telephoto Converter for T-Mount Lenses

Opteka High Definition 2X Telephoto Converter for The Opteka 650-1300mm, 420-800mm, 500mm and 800mm SLR Lenses Black

Opteka T-Mount (T2) Adapter Compatible for Canon EF EOS 80D, 77D, 70D, 60D, 60Da, 50D, 7D, 6D, 5D, 5Ds, T7i, T7s, T6s, T6i, T6, T5i, T5, T4i, T3i, T3, T2i, SL2 and SL1 Digital SLR Cameras