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Message: <blockquote data-quote="Eyelight" data-source="post: 359240" data-attributes="member: 24753">Simply put, the focal length of a lens is the length from the sensor to a  specific point in the lens.  More complicated, but lets keep it  simple.  So, focal length of a lens does not change unless you move the lens  closer or farther away from the sensor.  Assuming the lens is mounted to  a camera without adapter, extension, converter, etc.,  the focal length never  changes. Simply put, the change from FX to DX using the same  lens is the size of the captured image.  That's it.  A DX crops compared  to an FX.  It does not zoom, telephoto or magnify the subject in any  way.</blockquote>