Features: CAF 2XII TELEPLUS can make the focal length of all the for Canon EF lens increased to 2 times as respectively,and the autofocus function of the camera lens can be used perfectly, and don't change the EXIF information. CAF 2XII specially use for 100mm or more fixed focal length lens, but not recommend for use in less than 60mm of shortfocus lens. Specification: Mount Type: for Canon EFMount 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: Multicoated Exposure factor: Approx 4 times Item size: 6.7 x 5cm or 2.6 x 2.0in(DxH) Item weight: 131g or 4.64oz Package size: 9.5 x 9.5 x 9.5cm or 3.7 x 3.7 x 3.7in Package weight: 202g or 7.17oz Package List: 1 x Teleconverter 2 x Covers 1 x User Manual(ChineseandEnglish)