The iris is the mechanism which is a circular shield with a hole that opens and closes depending on how much light you want in the camera. The aperture is the name of that hole. The F-stop numbers is the scale of numbers that tells you how much light is coming into the camera (aperture size). The F-stop scale either doubles or halves the amount of light. The smaller the aperture, the less light is being let into the camera, giving the image a Deeper Dof. The larger the aperture, the more light is being let in, giving the image a shallower DoF.
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