The Macro Extension Tube set for Canon EF is composed of 3 extension tubes – with male and female EOS adapters. Mount the tubes between the lens and camera body to get your choice of macro ranges. It moves the lens farther from the film or digital sensor. The farther away the lens is, the closer the focus, the greater the magnification. This extension tube does not affect image quality as there is no optics inside. In comparison, a close-up filter is often blamed for degrading image quality. Specification:- Color: black Adjustable Length Camera Body Mount Adapter High-Quality OEM product Lens Mount Adapter 3 Tube insight, (6mm, 12 mm, 24mm) The more tubes you add, the closer the focus and the greater the magnification. Note: There are no electrical contacts in the extension tubes. Exposure has to be adjusted manually. Aperture control is not available if you use a lens that does not allow you to manually adjust the aperture (without an aperture ring). Package Includes 3 Ring Macro Extension Tube for Canon EOS EF DSLR SLR camera.