This is an in-depth review of the new Nikon TC-20E III teleconverter that was released in December of 2009, along with an updated version of the Nikon 300mm f/2.8G VR II lens. The Nikon TC-20E III is a major update to the existing Nikon TC-20E II teleconverter, sporting a brand new optical design with an aspherical element, which delivers better performance with many specialty telephoto lenses. The purpose of teleconverters is to increase the focal length of lenses, in other words to get closer to subjects, and the TC-20E III is the biggest and the longest teleconverter manufactured by Nikon – it doubles the focal length of a lens. While this teleconverter works with any professional Nikon lens that can take teleconverters, it is specifically designed to work with fast prime lenses with an aperture of f/2.8 and larger. The Nikon TC-20E III is targeted at sports, wildlife and other types of telephoto photography where the photographer cannot physically approach subjects.
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