More from Amazon.com : http://www.amazon.com/gp/product/B000U8Y88M?tag=purrfectcatdi-20 <br /> <br />Kenko DG Auto Extension Tube Set for the Canon EOS AF Mount. <br /> <br />Enables a lens to focus closer than its normal set minimum focusing distance <br />The DG extension tubes have no optics <br />Contains three tubes of different length a 12mm 20mm and 36mm <br />Designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure <br />Designed specifically for use with Canon digital SLR cameras and lenses
