The Canon EF 200-400mm f/4L IS USM Lens with 1.4X Extender is a high-performance super telephoto zoom lens with an optically matched built-in 1.4x extender for maximum versatility, built to satisfy the tough demands of sports and wildlife photographers. With a built-in 1.4x Extender, you can flick a switch to quickly switch your zoom range to 280-560mm (f/5.6). This capability is particularly useful in when it is not possible to change lenses quickly or in dusty and high humidity enivironments when changing gear isn't ideal.
The EF 200-400mm f/4L IS USM lens incorporates one fluorite and four UD lens elements that provide excellent correction of chromatic aberration throughout the entire zoom range for professional quality images with high resolution, contrast, and color fidelity. The 9-blade circular aperture delivers beautifully soft backgrounds. The lens also features inner focusing, ring USM, a high-speed CPU, and optimized AF algorithms for fast and accurate autofocusing. And, with Power Focus mode, focus shifts are quiet and smooth, which is a must for filmmaking.
Image stabilization is effective up to four shutter speed steps, with three image stabilization modes (standard, panning, and during exposure only) providing excellent results for a wide range of subjects. Optimized lens placement and coatings deliver outstanding color balance while minimizing ghosting and flare. The lens is highly resistant to dust and water, enabling shooting even in harsh conditions. A fluorine coating on front and rear lens surfaces repels dust particles and makes the lens easier to clean.