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Descriptions: The DG extension tubes have no optics. They are mounted in between the camera body and lens to create more distance between the lens and film plane. By moving the lens father away from the film or CCD sensor in the camera, the lens is forced to focus much closer than normal. The greater the length of the extension tube, the closer the lens can focus. It comes as a set (13mm+20mm+36mm). It contains 3pcs tubes in different length 13mm/20mm/36mm, which can be used in any combination or individually to obtain the different magnification. It is with electronic contacts,which make it support automatic focusing,automatic exposure,etc. The 20mm & 36mm tube are designed with 1/4" tripod mount. And it also comes with 2 caps (front and rear caps) to protect the mounts. Specification: Diameter of the tubes: Approx. 62mm Tube length: 13mm, 20mm, 36mm Built in Metal Bayonet & Plastic Body Suitable for: All EOS EF / EFS lens and camera with EF/EF-S mount Package including: Metal automatic macro extension tube 13mm + 20mm + 36mm set x 1 Front & Rear caps Kit x 1