These two innovative ultra-telephoto lenses owe their unparalleled low weight to a novel design that combines diffractive optics with a small, fixed aperture. They also employ a retractable sliding barrel that enables a remarkably short packed length. What’s more, the inclusion of optical stabilisation means they can readily be used handheld, without needing a monopod or tripod. Together this provides a combination of portability, affordability and telephoto reach for Canon full-frame mirrorless users that was previously only available with cropped-sensor cameras. As a result, they look sure to become popular for subjects such as wildlife, sport and aviation.