Featuring a circular aperture, this bright, fast telephoto lens produces a beautiful blur effect ideal for portraits or indoor sports photography. Its L-series optical system includes one fluorite and two UD elements, resulting in razor-sharp photos with minimal colour bleeding. Advanced image stabilization that reduces camera shake by approximately five full shutter speed steps*1 combined with a compact, lightweight magnesium-alloy design makes this lens ideal for hand-held shooting. Additionally, it offers great operability and mobility via an AF stop button and other features. The dust- and drip-proof design delivers outstanding reliability in adverse environments.