That's because the telelens isn't the wideangle lens corrected for cropsize ;) The point is that a 30mm on a 1.5 cropsize nikon wil yield the same image as a 45mm on a fullsize sensor taken from the same position. What you're talking about is comparing wideangle vs telephoto lenses which is a whole different subject matter. Taken from the same position, the wideangle and tele will give you the same perspective, but the subject in question will differ very much in size.

The only difference between the 45 and the 30 will arguably be the DOF because that is related to the focal length.

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