How stopping down aperture works

Started May 30, 2012 | Discussions thread
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Henzapper
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How stopping down aperture works
May 30, 2012

This is a really random question that's always sort of bothered me. To put it in simple terms, I know when you stop down the aperture, the hole in which the light goes through the lens is smaller. This results in less light as well as wider depth of field. What I never understood is, if the hole is getting smaller, how does that not just cause the a huge vignetting of the photo? Like, why doesn't the closing of the aperture blades appear in the photo? What sort of witchcraft makes this work?

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