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.
The aperture of the lens
The shutter speed
The ISO setting-how sensitive you want the camera sensor to be
aperture
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The same as the irises of your eyes, it controls the amount of light that passes through the aperture.
The Shutter and the Aperture are the two controls the Shutter is used to control how long the Film is exposed for and Aperture is used to control how much light is let in
The CCD is the part of the camera that changes the light that enters the camera into a digital signal that is then saved on the memory card. You can think of it as where the film would be in a regular 35mm film camera.
the F numbers usually refer to the aperture of the lens which controls how much light can enter the camera. it also affects the depth of field.
It is important that the sensor receives the correct amount of light. To restrict the amount of light would produce poor results.
the ISO setting in your camera controls the shutter speed therefore increasing or reducing the amount of light captured by the film/photocell
the iris controls the amount of light by limiting the volume of light admitted through the iris.
The pupil controls the amount of light that enters the eye.
SHUTTER in Camera controls the amount and time of light that the Sensor will exposed to.
It controls the amount of light that reaches the film.
The same as the irises of your eyes, it controls the amount of light that passes through the aperture.
The pupil. However, as it is a hole, i.e. an absence of anything it seems odd to say it controls anything. The iris controls the size of the pupil and therefore the amount of light entering.
The lens.
aperture is the amount of light which enters the camera. lower number the bigger hole ad the bigger hole is good for low light.
The pupil contracts or expands (dilates) to regulate the entry of light to the retina in the eye.The iris or colored part of the eye is what controls the diameter of the pupil by covering or uncovering it.
There are several factors that control the amount of UV light that enters the atmosphere. The main factors include the ozone layer and weather conditions.
The setting which dictates the amount of light that enters the lens. f-stop...f-1.4