Buy from Amazon.com : http://fave.co/1FteSxn <br /><br />Tamron AF 2x Teleconverter for Nikon Mount Lenses (Model 230FFN)<br /><br />Product Description : <br />Increases focal length from same camera position by 2x <br />Powerful and creative options for your telephoto photography <br />Fits easily between lens and camera body <br />Includes carry case <br />For use with Nikon Digital SLR cameras
