The Extender RF 1.4x. This teleconverter magnifies the image by 1.4x and retains full communication between the lens and camera body, enabling metering, autofocus, and image stabilization as well as the transmission of Exif data. The extender features high-refraction, low-dispersion glass to control the curvature of field and chromatic aberration of magnification for the highest image quality. Additionally, the Extender RF is dust and water-resistant and has a heat shield exterior to ensure optimal performance in a range of conditions.
Canon RF Extender 1.4x Specs