Aperture

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The aperture is a mechanism on the lens that regulates the amount of light falling through the lens. You can think of it as a simple hole, the size of which can be adjusted either directly on the lens or on the camera.

The aperture in photography is an iris diaphragm.

By Michael Häckel – photographed by himself, picture-free, https://de.wikipedia.org/w/index.php?curid=160941

Together with the exposure time and the light sensitivity (ISO), the aperture determines the exposure of the photo, the two being in direct proportion to each other. If I choose a larger aperture (the hole enlarges) I have to shorten the exposure time at the same time to get a correct exposure.

Furthermore, the aperture largely determines the depth of field: a large aperture produces a shallow depth of field, a small aperture a great depth of field.

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