Focal length and maximum aperture: 300 mm 1:4
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 / 4.9ft
Filter size: 77mm
Fixed focal length IS lens popularly used in wildlife and bird photography
Compact L-series telephoto lens with an Image Stabilizer which compensates for camera shake with 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. The image stabilizer also functions when using the Extender EF1.4x or Extender EF2.0 to provide that elusive 600mm shooting capability.
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