Extend the reach of select Canon RF-mount lenses with the Extender RF 2x. This teleconverter magnifies the image by 2x and retains full communication between the lens and camera body, enabling metering, autofocus, and image stabilization as well as the transmission of Exif data. Additionally, the Extender RF is dust and water resistant and has a heat shield exterior to ensure optimal performance in a range of conditions. Lens Compatibility RF 100-400mm f/5.6-8 IS USM RF 100-500mm f/4.5-7.1L IS USM (can only be used within 300-500mm range) RF 400mm f/2.8L IS USM RF 600mm f/11 IS STM RF 800mm f/11 IS STM RF 600mm f/4L IS USM | Canon | | Extender RF 2x | 4114C002 | Best Buy