The aperture is a variable opening in the
lens that controls the amount of light that reaches your camera’s sensor in a
given time. . It, in conjunction with
the shutter speed and ISO setting, determines the exposure of the photo. Given a consistent shutter speed and ISO
setting a narrow aperture will let in less light and a wide aperture more
light.
In addition the aperture affects the amount
of the photo that is in focus, called the depth of field. With a wide aperture only objects close to
the focal point will be in focus (shallow depth of field) while with a narrow
aperture objects further away from the focal point will be in focus (deep depth
of field).
In automatic mode the aperture is controlled by the camera.
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