The Zeikos ZE-ETC Manual Focus Extension Tube Set for Canon SLR & DSLR Cameras is the perfect item for shooting close-ups of insects, coins, stamps, oral surgery or any other macro photography you want to do. It consists of 3 different size tubes, 12mm, 20mm & 36mm. they can be used all together or separately or in any combination depending on the close-up ratio that you want. The tubes go inbetween the camera and the original lens.