Features: C-AF 2XII TELEPLUS can make the focal length of all the for Canon EF lens increased to 2 times as respectively,and the auto-focus function of the camera lens can be used perfectly, and don't change the EXIF information. C-AF 2XII specially use for 100mm or more fixed focal length lens, but not recommend for use in less than 60mm of short-focus lens. Specification: Mount Type: for Canon EF-Mount lens Magnification: 2 times Depth of field: Half of the lens Constitution of the lens: 7 glasses,4 groups Focus mode: full auto focus Lens coating: Multi-coated Exposure factor: Approx 4 times Item size: 6.7 * 5cm / 2.6 * 2.0in(D*H) Item weight: 131g / 4.64oz Package size: 9.5 * 9.5 * 9.5cm / 3.7 * 3.7 * 3.7in Package weight: 202g / 7.17oz Package List: 1 * Teleconverter 2 * Covers 1 * User Manual(Chinese&English)