Canon's EF 800mm f/5.6L IS USM Autofocus Lens is a sensational lens with exceptional capabilities for long-distance applications. As one of the longest lenses in Canon's line-up, it uses a refined optical design, with two fluorite lens elements, one UD element, and one Super-UD-glass element, for outstanding correction of color fringing and superb contrast and sharpness.
Whether you're shooting outdoor sports, wildlife or news events, the EF 800mm f/5.6 IS will optimize your shooting power. Weighing under 10lbs, this lens is also lighter than you would expect while, at the same time, featuring a magnesium-alloy barrel construction for durability. It also includes weather-resistant gaskets throughout for use in harsh conditions.
The EF 800mm f/5.6 IS compatible with both the EF 1.4x II and 2x II tele extenders for even more reach: EOS cameras with 45 AF points will continue to provide autofocus at the center AF point when the lens is used with the 1.4x extender.
Finally, The Ef 800mm f/5.6 is image stabilized, providing up to 4 stops of correction for camera shake. This makes it even more practical in many situations.