Kenko - Macro Extension Tube Set - 3 tubes: 12, 20, and 36 mm - for Canon EF and EF-S Lens - Black

Extension Tubes are designed to enable a lens to focus closer than its standard minimum focus distance. This has the effect of magnifying the subject so that it appears larger in the viewfinder and resulting images. Extension tubes are exceptionally useful for macro photography, allowing almost any lens to be used for close-up work, maintaining its original optical quality at a fraction of the cost of a dedicated macro lens.