In terms
of photography, aperture is defined as the opening in the lens through which light
passes to enter the camera. This concept is very similar to that of the human
eye, since as one moves between bright and dark environments, their iris either
expands or shrinks, controlling the size of the pupil as a means of protection.
The
aperture can either be shrunk or enlarged to allow more or less light to reach
the camera sensor. One of the purposes of aperture is to add dimension to
photos and film by controlling depth of field. At one extreme, aperture
creates a blurred background with a shallow focus effect.
At the
other, it will create sharp results from the nearby foreground to the distant
horizon. In addition, aperture also serves the purpose of altering the exposure
of images and film by making them brighter or darker.
For depth
of field, a large aperture results in a large amount of
both foreground and background blur. This is often desirable for portraits, or
general photos of objects where the subject is meant to be isolated in terms of
visuals. It is also possible to frame the subject with foreground objects,
which will also look blurred relative to the subject. On the other hand,
a small aperture results in a small amount of background blur, which
is typically ideal for types of photography such as landscape and architecture.
Regarding
exposure, as aperture changes in size, it alters the overall amount of light
that reaches the camera sensor – and therefore the brightness of the image or
film. A large aperture will pass a lot of light,
resulting in a brighter result, whereas a small aperture does the opposite,
producing a darker result.
https://photographylife.com/what-is-aperture-in-photography
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