Canon EF 300mm f/4L IS USM Telephoto Fixed Lens for Canon SLR Cameras Focal Length & Maximum Aperture:300mm 1:4.0 Super multi-layer lens coating reduces flare and ghosting 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 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