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Message: <blockquote data-quote="Woodyg3" data-source="post: 359227" data-attributes="member: 24569">It doesn't change the focal length, that's a physical property of the lens that can't change. In the case of the 70-200mm, with the smaller sensor of a DX, it gives the same field of view as a 105-300 on a 35mm camera or FX Nikon digital camera, which has a sensor the same size as a 35mm film negative. it's all sort of semantics, and yet it's important to understand the difference.Edit: I see Wayne beat me by a couple of minutes with a more complete explanation. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>