This high-performance lens was designed with portability and handling ease in mind. One Super UD-glass element, whose characteristics are 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.
Features:Focal Length & Maximum Aperture: 400mm 1:5.6 Lens Construction: 7 elements in 6 groupsDiagonal Angle of View: 6 degrees 10'Focus Adjustment: Inner focusing system with USM Closest Focusing Distance: 3.5m / 11.5 ft.Filter Size: 77mmMax. Diameter x Length, Weight: 3.5" x 10.1", 2.8 lbs. / 90.0 x 256.5mm, 1250g