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What is the function of a diaphragm in a film camera

What is the function of a diaphragm in a film camera
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What is the function of a diaphragm in a film camera

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User Greg Burd
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In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture.
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User Chris Yo
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