VILTROX Auto Focus 2X Teleconverter Extender Converter for Canon EF Mount Super Telephoto Lens 135mm f2L200mm300mm400mm600mm70200mm100400mm and DSLR Camera 5DII 80D 760D 7DBlack

The 2X Teleconverter can make the focal length of all the Canon EF lenses increased to 2 times Builtin 4 groups 7 pcs optics and the exposure factor enlarge approx 4 equals to 2 aperture Compatible for Canon EF Mount LensNoticeIt only compatible with fixed focal length Lseries lenses 100mm and over as well as the EF 70200mm f28L EF 70200mm f28L IS EF 70200mm f4L and EF 100400mm f4556L Support lens Auto Focus functionOutstanding image quality thanks to new optical design and improved AF performance The focus speed is really fast and can track the subject and lock the subject flexibly and accurately Lens coatings are optimized to minimize ghosting and flare With the aperture adjustment lever on the adapter you can adjust the aperture fast With an upgraded USB firmware interface it supports USB firmware upgrading and through subsequent upgrades the adapter can improve its function and fix bugs