These flagship super-telephoto lenses for professionals and advanced amateurs can be used in various challenging scenarios, from international sporting events to scorching savannas and airplane photography. The 400mm lens is the most lightweight in its class, after undergoing significant weight reduction. Thanks to newly-developed heat-resistant paint, its adaptability to various usage environments was improved. Operability was improved by reexamining components from scratch, and the lenses were designed to fit snugly into the mount, giving the user a strong sense of security.