Canon 5176B002 EF 200-400mm f/4L IS USM Extender 1.4X Lens Type: Telephoto Lens Diameter: 52 mm Specifications: Focal Length & Maximum Aperture: Built-in extender at 1x: 200-400mm, 1:4.0 Built-in extender at 1.4x: 280-560mm, 1:5.6 Lens Construction: Built-in extender at 1x: 25 elements in 20 groups (incl. 1 rear filter) Built-in extender at 1.4x: 33 elements in 24 groups (incl. 1 rear filter) Diagonal Angle of View: Built-in extender at 1x: 12degree-6.1degree Built-in extender at 1.4x: 8.5degree-4.25degree Focus Adjustment: Inner focusing system Closest Focusing Distance: 6.6 ft. / 2m Max. Diameter x Length, Weight: 5.0 x 14.4 inches, 127.7 oz.
