JJC 3-Piece (12mm/20mm/36mm) Metal Set Automatic Macro Extension Tube for Canon EOS Camera

The autofocus extension tube assembly (or the tube used in standalone mode) allows your lens to get closer to its normal minimum focal length. By putting the distance between your camera body and the lens, the focus distance is shortened and the effect of enlarging your subject is created. Extension tubes allow macro performance for lenses that are not able to get close together and are also suitable for close-up portrait. The autofocus extension tube set for Canon EF/EF-S Mount contains three extension tubes in length of 12mm, 20mm and 36mm. They can be used individually or together to create the desired magnification effect. For more thorough use, use the wider extension tube or stack the tubes together. It is even possible to stack these tubes with other people from another set. The extension tubes do not have optical elements so as not to degrade the quality of your lenses. These are fully automatic extension tubes in that they can communicate all electronic functions from the lens to the camera, including autofocus and auto exposure. They are constructed with metal lens holders for durability and longevity and allow you to convert almost any lens into a macro lens at a fraction of the cost while maintaining the original optical quality of the lens. Specification: Canon sets: fits Canon EF/EF-S mounting cameras, with 12mm, 20mm and 36mm length tubes