The new Canon EF 200-400mm f/4L IS USM Lens with Internal 1.4x Extender from Canon is a high-performance super-telephoto zoom lens, Ultrasonic Motor focusing, and three Image Stabilizer modes with a built-in 1.4x extender that converts the focal range and maximum aperture to 280-560mm f/5.6. The extender is located at the base of the lens and applied with a simple lever switch.
The optical construction has been optimized and incorporates one fluorite lens and four Ultra-Low-Dispersion elements to minimize chromatic aberrations throughout the zoom range. Full-time manual focus override, AF stop buttons, a focus preset and a focus limiter function are available as well as a Power Focus mode to provide smooth, electronically controlled focusing that is well suited to video applications. The lens comes with a dedicated lens hood, accessory monopod mount, a drop-in gelatin filter holder and a fitted hard case for protecting and carrying the lens and its accessories. Available now for pre-order via B&H (click here).
Canon 200-400mm, Canon F/4L IS, Canon Internal Switch Extender
Canon 200-400mm F/4L IS with Internal 1.4x Extender switch (280mm-560mm F/5.6)