A Macro Extension Tube is an affordable and simple way to turn your existing lens into a Macro Lens. Unlike the add-on close-up lens, it will not alter the optical quality. The extension tube will work with your Canon EOS Camera. The Fotodiox Macro Extension Tube provides you with 2 mounting rings and 3 middle extension sections that allow you to make close-up photos when using your digital or film SLR cameras. You can change the magnification of your lens by using the mounting rings with (or even without) the extension tubes to increase your ability to take close up photographs.