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Comments
If you aren't in perspective view, there is no "depth" in the graphics area, so zooming enlarges/shrinks the model rather than "getting close to it" as in perspective view. That's the main difference between the perspective/normal view.
because when it`s in non perspective view, it is as if you were always looking from a camera orbiting the object, and when you zoon in, you just increase the size of the object, you don`t actually get closer to it. The camera is at an infinite distance of the object, so all parallel lines are always parallel.