Neewer Auto Focus Macro Extension Tube Set for Canon EOS Cameras Such As Canon EOS 1d,1ds,5D Mark II,7D,10D,20D, 30D,40D,50D,300D,350D,400D,450D,500D,550D,650D,700D,1000D (Metal Bayonet)(Blue) Lightweight design^Material: Aluminum + Plastic^Perfect coupling with TTL.AE Metering^Use Individually or Combined