Auto Automatic Focus Macro Extension Tube Set DG for M43 Micro 4/3 M4/3 Lens Mount Cameras Suitable for: All Four Third Micro 4/3 M43 mount camera Package including: Metal automatic macro extension tube 10mm + 16mm set x 1 It comes as a set (10mm+16mm). It contains 2pcs tubes in different length 10mm/16mm, which can be used in any combination or individually to obtain the different magnification. 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.