|Focal Length & Maximum Aperture||300mm 1:4.0|
|Lens Construction||15 elements in 11 groups|
|Diagonal Angle of View||8° 15'|
|Focus Adjustment||Rear focusing system with USM|
|Closest Focusing Distance||1.5m / 4.9 ft.|
|Max. Diameter x Length, Weight||3.5" x 8.7", 2.6 lbs. / 90.0 x 221.0mm, 1190g|
Compact L-series telephoto lens with an Image Stabilizer which compensates for camera shake with the equivalent effect of a shutter speed two stops faster. Two Image Stabilizer modes are provided: Stabilizer Mode 1 (the same mode featured on the EF 75-300mm f/4-5.6 IS USM) and the new Stabilizer Mode 2 which steadies the image during horizontal or vertical panning. Mode 2 detects the panning direction automatically. The closest focusing distance is 4.9 feet (1.5 m).