The Kenko DG extension tubes of 12/20/36 mm convert almost any lens into a macro lens at a fraction of the cost while maintaining the original optical quality. They are mounted between the camera body and the lens to create more distance between the lens and the film plane.

By removing the lens from the film or CCD sensor of the camera, the lens is forced to focus much closer than usual. The longer the extension tube, the closer the lens can focus.