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Message: <blockquote data-quote="hkaborn2" data-source="post: 633908" data-attributes="member: 38772"><p>I am considering purchasing the above lens and dedicated teleconverter for use with my D5500. I understand that since my camera is a DX model, the lens will function like a 105 - 300mm lens on a full frame camera. If I use the teleconverter, will that make the lens function as a 210-600mm lens? Are there any issues or problems that I should anticipate if I the buy this lens & teleconverter? If instead  I were to purchase the new Sigma 100-400 lens, would I be able to obtain comparable magnification at the long end?</p></blockquote><p></p>