This large-aperture telephoto zoom lens (fixed F stop type), provides f/2.0 aperture through the entire zoom range. It is equivalent to 70-200mm on a 35mm camera, and covers from medium-telephoto range of natural angles to telephoto area with a compressed perspective effect. Its fast shutter-speeds and beautifully soft out-of-focus image behind the main subject are an ideal for portrait, theatrical and sports shooting under the low-light. Luxurious optical glass elements, such as, four ED lenses and one super ED lens are used to give the highest image quality with optimal resolution and contrast.