Red Metal Auto Focus Macro Extension Tube Set for Canon SLR Cameras CANON EF EF-S Lens This Macro Extension Tube Set includes 3 extension tubes:13mm,21mm,31mm This macro extension tube set is suitable for all Canon EF EF-S and IS series lenses. Transform your Lens into a Macro Lens Red Metal Auto Focus Macro Extension Tube Set for Canon SLR Cameras CANON EF EF-S Lens This extension tube does not affect image quality as there is no optics inside In comparison, a close up filter is often blamed for degrading the quality of image. Auto-focus function can operate