Neewer Auto Focus Metal Bayonet Macro Extension Tube Set for Canon DSLR Cameras Such as EOS 1d,1ds,Mark II,III,IV,5D Mark II,7D,10D,20D,30D,40D,50D,300D,350D,400D,450D,500D,550D,650D,700D,1000D Neewer&reg; Auto Focus Macro Extension Tube Set for Canon EOS DSLR SLR Lens, Extreme Close-Ups (Black), fits Canon EOS 1d, 1ds, Mark II, III, IV, 5D,Mark II, 7D, 10D, 20D, 30D, 40D, 50D, Digital Rebel xt, xti, xs, xsi, t1i, t2i, t4i, t5i 300D, 350D, 402D,, 500D, 550D, 650D, 700D, 1000D (Metal Bayonet));Lightweight design^Material: Alumium + Plastic^Perfect coupling with TTL.AE Metering^Use Individually or Combined