Extension tubes are a perfect solution to allow ultra close focusing without sacrificing the optical properties of your lens. ProMaster Macro Automatic Extension Tubes are engineered for a precise fit and proper communications between your camera lens and body. 

The ProMaster 8826 Automatic Extension Tube Set for Canon EF mount includes three tubes (12mm, 20mm, 36mm) that can be used individually or in combination to gain the right magnification for your particular need.