@MichaelClark answered a question I posted about zoom using focal length (emphasis added):
You are correct that a focal length twice as long (2X zoom) as the original one will make objects appear twice as tall and wide in a photo taken from the same location. The perspective of the picture taken from twice as far with 2X zoom will be different than the one taken from half the distance and the same focal length, though.
I don't really understand how those perspective changes would impact the produced image. A photo demonstration of this effect would really be helpful I think. Maybe the same picture taken once with twice the focal length and twice the distance and once with half?
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