Jerald,
I think you've misunderstood the scenario. We're shooting from the SAME point or SAME distance from whatever subject it is we're concerned with.
An object will ONLY appear larger against background if you move in CLOSER with your camera to cover the same view with a wider lens. And this WILL change perspective which cannot be later altered by enlargment. However, a shot from SAME point. regardless of lens used, will produce exactly same persepctive. I added enlargment and/or cropping, because a wider lens from identical point will show more in the straight image than a longer lens will. So it needs to be cropped in order to see the same up to the margins. Cropping alone would make the final image smaller, so it will then have to be enlarged, and then compared side by side, to see the identical perspective they've produced.
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