The Canon Extender RF 1.4x is an RF-mount teleconverter designed to extend the focal length of compatible Canon RF lenses by 1.4x. It provides additional telephoto reach while maintaining communication between the lens and camera body for metering, autofocus, image stabilization, and EXIF data transmission.

Designed for compatible RF super-telephoto lenses, it features a 1-stop light loss, dust and water resistance, and a heat-shield exterior. It is suited to wildlife, sports, bird photography, and other applications requiring increased focal-length reach.