The Canon EF 1.4x III extender increases the focal length of Canon L-series telephoto or telephoto zoom lens by a factor of 1.4x, with higher AF accuracy and improved communication between camera and lens.

Ideal for press, sports and nature photography, the Canon EF 2x III extender increases the focal length of Canon L-series telephoto or telephoto zoom lenses by a factor of 2x.

By mounting the Sigma 1.4x TC-1401 teleconverter between a telephoto lens and camera, the focal length of the lens becomes magnified by 1.4 times.