I mean..in movies when there are a lot zoomed lights, like car lights, street lights or similar they all looks like octagons. Do you know why?
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This is caused by the shape of the aperture (not the shutter)
The aperture is a hole in the lens through which the light passes to get to the film or sensor. The aperture can open or close to control the amount of light that passes through in a given amount of time, with a bunch of other side effects (the one folks are usually most interested in is the depth of field, which is the distance between the where something is too close to be in focus and where something is too far to be in focus)
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