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  • The EF 70–200mm lens is a telephoto zoom lens made by Canon Inc. The lens has an EF mount to work with the EOS line of cameras. The lens comes in five different versions, all of which have fixed maximum aperture at all focal lengths and are L-series lenses. f/2.8L IS USM f/2.8L IS II USM f/2.8L USM f/4L IS USM f/4L USM The f/4 non-IS version, the least expensive L-series lens Canon makes, is popular among weight-sensitive landscape photographers and hobbyists who want L lens quality without spending thousands of dollars. The f/2.8 versions are popular among event photographers and photojournalists where the lower light capabilities are required; some portrait photographers also prefer this lens for the improved background blur produced by the f2.8 aperture. The non-IS f/2.8 version was released in 1995 and replaced the EF 80–200mm f/2.8L lens. The IS version lenses use circular eight-bladed diaphragms which maintain a nearly circular aperture when stopped down by up to two stops. The f/2.8 and f/4.0 image-stabilized versions also feature weather sealing when mated to a weather-sealed camera to such as the Canon EOS 1D-series bodies. Wikipedia

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