NEEWER MET-C1 Set Automatic Extensions Tube Ring for Canon EOS EF / AF 3 rooms: 13 mm, 21 mm, 31 mm Bayonet - for Canon EOS Canon EOS 1D C, 1D X, 1D Mark I-IV, 1Ds I-Mark III, 5D Mark I-III, 6D 7D 60D 50D 40D 30D 20D 10D 1000D REBEL T4i/650D REBEL T3i/600D REBEL T2i/550D REBEL T1i/500D REBEL T3/1100D