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Message: <blockquote data-quote="Don Kuykendall_RIP" data-source="post: 508778" data-attributes="member: 6277">They can make the lenses smaller since they do not have to cover as much sensor. That is the short simplified answer. That is also the reason that many of us like to use FX lenses on our DX cameras. The DX only uses the center part of the FX lens which is the prime part of the lens.  DX lenses are great though for your DX camera. I see that you have the 18-140, that is a great walk around lens. I much preferred it over the 18-55. In my opinion it has better IQ along with the better reach. Don't know to much about the 55-300 though. I have the 70-300 for use on my 2 bodies.</blockquote>