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The aperture is like the iris of the eye. When the aperture is very small, you will get a sharper focus and more depth of field-- near and far things in the scene will tend to be sharper. This is because the smaller circle is cutting down on the "confusion" caused by the countless overlapping circles of light being focused on the film or other light sensitive surface in the camera. The down side is that because the iris is smaller, less light is getting in, and you need a longer exposure to get a good image. When the aperture is larger, you can get a good image with a faster exposure, but sharpness and depth of field may suffer a little. The "circles of confusion" are larger, because the aperture is larger.

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17y ago
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11y ago

The aperture in a camera is used to regulate the amount of light that passes through the lens onto to film at the moment the photograph is taken. The aperture size can be varied using settings on the camera.

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13y ago

The shutter of a camera opens and closes allowing light into the camera, the hole in the shutter is the aperture.

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Q: How does Aperture work?
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