Canon FD Lens, Manual Book

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Field or angle of view is not the only thing a photographer has
to consider. Perspective, or the sense of depth, controls the
spatial relationship between one subject and another. In the
pictures below each focal length tells a different story. At
28mm, 50mm, 100mm, and 200mm, the camera was moved so
that the subject's size remains the same in the images. The dif-
ferences arise in the background. It seems to go on forever
when a 28mm wide angle is used, but looks very close to the
subject when shot with the telephotos. That's why the best way
to make a subject really stand out from its surroundings is to
use a wide-angle lens and shoot from a relatively short
distance. On the other hand, to create an image that appears
"flat," use a telephoto lens and stand back. Here again, a zoom
lens lets you get the perspective you want without having to
change lenses.
Wide angles for an exaggerated sense of depth; telephotos for flatness —
Perspective.
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