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Message: <blockquote data-quote="480sparky" data-source="post: 248156" data-attributes="member: 15805">The only difference between an FX and DX lens is the size of the circle they project.  FX lenses need to project a larger circle to cover the larger FX sensor.  DX lenses project a smaller circle as they only need to cover a smaller area of the DX-format sensor.Focal length has nothing to do with the size of the sensor of the camera... it's a matter of optics that determines to focal length.  A 50mm lens is still 50mm, whether it's on a cell phone camera or an 8x10 view camera.</blockquote>