Mcoplus C-AF 2X Magnification Teleconverter Extender Auto Focus Mount Lens for Canon EOS EF Lens 5D II 7D 6D T5i T4i T3i 5D II 7D 1200D 760D 750D 1100D 5D III 60D 70D DSLR Camera Mount Type: for Canon EF-Mount lens (camera not inclued) Depth of field: Half of the original lens Constitution of the lens: 7 glasses,4 groups Mcoplus Viltrox C-AF 2X TELEPLUS can make the focal length of all the for Canon EF lens increased to 2 times as respectively The auto-focus function of the original camera lens can be used perfectly, and don't change the EXIF information C-AF 2X specially use for 100mm or more fixed focal length lens, but not recommend for use in less than 60mm of short-focus lens.