Canon EF 200-400mm f/4L IS USM Extender 1.4x

Aimed squarely at professional sports and wildlife photographers, the Canon EF 200-400mm f/4L IS USM Extender 1.4x lens is a high-performance super telephoto zoom lens with an optically matched, built-in 1.4x extender. The benefit is in applications where it is not possible to change lenses quickly, while also protecting delicate equipment such as a digital SLR camera’s image sensor in environments with dust and high humidity. The lens incorporates one fluorite and four UD lens elements and a 9-blade circular aperture. A Power Focus mode makes focus shifts quiet and smooth, invaluable for filmmaking. The lens is also highly resistant to dust and water.