This high-performance lens was once designed with portability and handling ease in mind. One Super UD-glass element, whose characteristics are very similar to fluorite, and one UD-glass element result in sharp pictures from corner-to-corner. The lens also has a built-in hood and a detachable tripod mount.
From the Manufacturer
Light. Portable. Excellent handling. Sharp. And amazingly fast autofocus. The 400mm f/5.6L is all of this stuff, and a premier choice for wildlife and nature photographers–one of the crucial finest telephoto lenses on the earth for fast-moving subjects such as birds in flight or motor sports. It uses UD-glass elements to provide outstanding optical quality, even wide-open, and image quality is preserved when used with either the EF 1.4x II or EF 2x II tele extenders. It accepts 77mm filters, and has a built-in removable tripod collar.
See a Different Dimension
A super telephoto lens can make an atypical scene into an ordinary one. Its ability to see surpasses that of the human eye. It can compress images and lead them to look as if they come from another dimension. It opens up new realms of photographic expression. All EF super telephoto lenses are L-series lenses to give you the highest quality. The USM provides quiet and high-speed autofocusing. These lenses promise outstanding delineation and put your imagination to the test.
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lens construction: 7 elements in 6 groups.Center of attention Adjustment: Inner focusing system with USM
Diagonal Angle of View: 6° 10′ .Fluorite and Ultra-low Dispersion-glass; internal focusing; full-time manual Center of attention
Closest Focusing Distance: 35m / 115 ft
Focal Length & Maximum Aperture: 400mm 1:56
Filter size: 77mm