Nikon TC-20E AF-S Teleconverter III
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The world’s first teleconverter to incorporate an aspherical lens element for outstanding resolution and contrast, the Nikon TC-20E AF-S III is teleconverter doubles the effective focal length of certain Nikkor lenses without increasing the closest focusing distance. For example, using this teleconverter with a 200mm lens will effectively increase the focal length to 400mm and it will also cut out the amount of light by 2 f-stops. It is both compact and lightweight, making it a cost-effective and a practical solution for those times when it is not possible or desirable to carry an extra telephoto lens with you.