Image Description: A photograph of an older style camera with the lens diaphragm able to be seen. In the early years of photography, a set of interchangeable diaphragms could be swapped out and fitted on a camera; these were often made of brass strips known as Waterhouse stops or Waterhouse diaphragms. Modern cameras now use a type of adjustable diaphragm, called an iris diaphragm, or simply an iris. These thin opaque structures are designed to stop the passage of light from reaching the focal plane and thus they are sometimes referred to as a stop, or aperture stop. There is an amazing natural optical system containing a diaphragm in the human eye itself, where the opening in the iris of the eye is the diaphragm!

Image category: Creativity (Writing, Design, Photography, etc)

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