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Message: <blockquote data-quote="WayneF" data-source="post: 194119" data-attributes="member: 12496">I think you mean a "teleconverter", for extending focal length, usually 1.4x, 1.7x, or 2x longer.      An "extension tube" is something quite different, a glassless tube for very closeup macro work.See <a href="http://www.bhphotovideo.com/c/search?&ci=278&N=4077634487+4294185277" target="_blank">Teleconverters | B&H Photo Video</a>   for what is available.  The Nikon brand teleconverters each have a small list of compatible lenses.The teleconverters are not very sharp in the corners, and need to be used well stopped down (like f/8) to maintain some of the sharpness.  An actual real longer lens is often the best choice.</blockquote>