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Focal length is the distance (measured in mm) between the surface of a lens and the focal point, when the lens is focussed at infinity. Smaller focal lengths indicate wide-angle lenses, larger focal lengths indicate a telephoto lens.

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As far as I know, nothing. The viewfinder size depends on the camera so with a different body at the same focal length the object might have a different size.
answered Mar 13 '11 by eWolf