The Canon RF 400mm f/2.8 L IS USM inherits the EF model's superior optics and offers excellent image quality as well as light mobility. At maximum aperture, the lens delivers edge-to-edge sharpness and produces crystal clear images with incredible detail. Never Miss A Moment with High-speed Continuous Shooting The RF 400mm f/2.8 L IS USM lens is compatible with the EOS R system's high-speed continuous shooting. You are able to photograph fast-moving subjects, such as sports or wild animals, without missing a beat. When paired with the Canon EOS R3's electronic shutter, you can capture up to 30 frames per second. Reduce Camera Shake with Handheld Shooting The lens offers 5.5 stop Image Stabilisation (IS) when used with the Canon EOS R or EOS R5 resulting in less shake when shooting with a large telephoto lens. The RF 400mm offers three IS modes based on the subject's movement and enables the user to experience stable handheld shooting. Make Smooth Changes When making a video. The aperture can be controlled with a 1/8 step resolution while filming. This allows for smooth adjustment when there is a sudden change in brightness, resulting in natural-looking footage.