Extender RF2x Expand your versatility with Canon’s Extender RF2x. An ideal complement to sports and wildlife photographers, this dust- and water-resistant extender features a smart-connect design that attaches effortlessly to select RF series lenses*, increasing the focal length by a factor of 2x. Engineered with a combination of advanced optics, optimized coatings and high-quality construction ― including a heat shield exterior ― the Extender RF2x keeps chromatic aberration, ghosting and overheating to a minimum, delivering exceptional results in situations where getting closer to your subjects matters.