That's not correct, the focal length always stays the same. It's a common misconception. Just set the focal length to whatever it says on the lens.
With an APS-C camera, a 500mm lens delivers the same field of view as a 750mm
would on full frame, but that's only because the latter sees more of the frame. The lens delivers the same degree of magnification.
That said, a 500mm lens is pretty long, and it should give you plenty of reach
A 50mm on APS-C is also more of a short telephoto rather than a normal field of view.
Adam
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