Hopefully this illustration of a pin hole camera will clarify:
pin hole camera http://clowder.net/hop/persp/Perspec2.gif
(source: clowder.net)
broken image fixed (click 'rendered output' or 'side-by-side' to see the difference); for more info, see https://gist.github.com/Glorfindel83/9d954d34385d2ac2597bbe864466259f
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