2.0X Teleconverter (Doubler) Extender for Canon EOS & Rebel Series EF/EF-S Lenses

This Digital Nc Autofocus Teleconverter mounts between a Canon (or compatible) EF/EF-S lens and a Canon camera to double the effective focal length of the attached lens while adding only a small amount of bulk. It preserves electronic communication between camera and lens for AF and exposure functions. Optical construction consists of four multicoated elements arranged in three groups to help retain image clarity and reduce ghosting and flare. Expect a 2-stop light loss when using the teleconverter. Technical specifications: Mount: Canon EF/EF-S; Magnification: 2x; Optical Design: 4 Elements in 3 Groups; Light Loss: 2 Stop; Length: 1.42" / 36 mm; Diameter: 2.68" / 68 mm; Weight: 5.89 oz / 167 g; Package Weight: 0.535 lb; Box Dimensions (LxWxH): 3.5 x 3.5 x 3.3".