Refurbished Canon EF 1.4X III Telephoto Extender for Canon Super-Telephoto Lenses

Refurbished Canon EF 1.4X III telephoto extender designed for use with Canon EF super-telephoto lenses. It increases the effective focal length by 1.4x (Focal Length & Maximum Aperture Magnification: 1.4x) and typically reduces the lens maximum aperture by one stop. Optical design: 7 elements arranged in 3 groups. Physical dimensions — Max. Diameter x Length: 2.8" x 1.1" (72.0mm x 27.2mm).