Because its diameter can be changed to alter the light level on the sensor behind it. In a camera this is done by altering the f/number. In the eye it occurs via an automatic physiological response.
Exposure, in digital or film photography, is determined by aperture and shutter speed. On a manual camera, the user selects both values.On an automatic camera, there are four possibilities:Manual mode. User selects both aperture and shutter speed.Shutter priority. User picks the shutter speed and the camera adjusts the aperture to ensure proper exposure.Aperture priority. User picks the aperture and the camera adjusts the shutter speed to ensure proper exposure.Program mode. The camera selects both values.
The hole in the shutter allowing light into the camera.
The functional opening is the aperture, the opening that controls the amount of light that hits the photosensitive surface. You may have a camera with interchangeable lenses that screw into and out of the camera's body. The opening into which the lens is screwed is not the aperture.
A manual camera is a camera that does not have any automated functions, like film transport that winds the film, or exposure modes like shutter or aperture priority. Most manual cameras also do not have auto-focus capability.
It is identical in action to the iris in your eye, it widens and narrows to allow only the required amount of light through the aperture hole/pupil
The iris is like the aperture part of a camera, which used to also be called the iris.
The aperature can control the amount of light that comes into the camera just like the pupil of the eye.
The aperture is the closest thing to a pupil.
The pupil of the eye can be likened to a camera aperture. Just as an aperture controls the amount of light entering a camera, the pupil regulates the amount of light entering the eye.
The pupil is the center round black part of the eye. This is where the light enters into the retina. The human pupil works much like the aperture of a camera.
The focusing lens of the camera
The camera aperture is like the pupil of the eye, adjusting in size to control the amount of light that enters the camera. A smaller aperture lets in less light, while a larger aperture lets in more light. This helps to regulate the exposure of the image being captured.
The part of the eye that functions like an aperture is the iris. The iris controls the size of the pupil, which adjusts the amount of light that enters the eye, similar to how an aperture regulates light in a camera. When light levels change, the iris expands or contracts to optimize vision in varying lighting conditions.
The part of the eye that is similar to the shutter in a camera is the iris. It regulates the amount of light entering the eye by adjusting the size of the pupil, functioning like a camera's aperture to control the amount of light reaching the retina.
The iris acts like the aperture of a camera lens.
To adjust the aperture on a Nikon camera, turn the command dial to select the desired aperture value. The aperture setting is typically displayed on the camera's LCD screen or in the viewfinder.
The shutter of a camera opens and closes allowing light into the camera, the hole in the shutter is the aperture.