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Circular blades of a mechanical iris create a precision opening controlling amount of light entering a camera lens with the opening mechanism controlling the aperture and the depth of field in focus.
Adjusting aperture camera lens. The camera iris slowly opens and then closes. Aperture blades opening and closing slowly. Camera lens aperture close up.
Photographer hand changing manual aperture ring on the camera lens. Lens camera manual focus. Changing exposure with aperture ring on manual lens.
Photographer hand changing manual aperture ring on the camera lens. Lens camera manual focus. Changing exposure with aperture ring on manual lens.

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