Neewer Macro Focusing Focus Rail Slider Macro Bellows for +4 Way Macro Focusing Focus Rail Slider /Close-up Shooting with 1/4" Thread for Canon EOS Cameras,Such as Canon EOS 550D/Digital Rebel T2i;EOS 600D/EOS Rebel T3i;EOS 1100D/EOS Rebel T3;EOS 450D/Digital Rebel Xsi;Canon EOS 50D/40D