What is an aperture on a camera?

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The aperture is an opening within the lens whose size is controlled by a series of overlapping blades. It's sole purpose is to control the amount of light that reaches the film or digital sensor during the exposure time. Anything else, such as depth of field, is a spin off of its function.

The size of this opening is controlled by settings on the camera shutter speed/aperture dial or on the lens. Many cameras do not have the ability to "stop down" the aperture before the moment of exposure, so it is not something most people can observe. At the moment of exposure, the blades move to create an opening within the lens just before the shutter opens to control the duration that this occurs. Together, they control the exposure.

We quantify the size of this opening with F numbers. Simply put, the F number expresses how many times an aperture will fit into the focal length. Thus, in a 100mm lens, F4 means it will fit in 4x and will be 25mm in diameter. In a 200mm lens, F4 represents an opening of 50mm. This explains why longer length lenses typically have larger maximum apertures, and why the higher F number represents a smaller aperture (F16 must fit into the focal length 16x, thus it has to be smaller).

The answer moved to the discussion page, while good, was more about the effect of the aperture and really belongs in a answer to a question about depth of field.
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What is a camera aperture?

The cameras aperture solely depends on how fast the lens is that is mounted to the camera. An aperture is the size of the opening in the lens, depicting the amount of light le

How does a camera aperture work?

Answer . The aperture is like the iris of the eye. When the aperture is very small, you will get a sharper focus and more depth of field-- near and far things in the scene

Where is the aperture on a camera?

The iris, which sets the working aperture, is located inside the lens. The aperture numbers are a ratio of the length of the lens to the diameter of the front element, or th

What is an aperture of a camera?

The word aperture refers to the diaphragm opening inside a photographic lens. it works in a similar way to the iris in the human eye. Just like the iris regulates the amou

What is aperture on camera?

The aperture is the hole in the shutter that lets in light to take your photo, affecting exposure.

How is the aperture of the camera like a pupil?

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

What is aperture priority of digital camera?

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 fou
In Cameras

Where is it possible to learn about camera apertures?

An individual can learn about apertures in several different ways. Photography websites, such as Nikon USA, explain how to choose apertures. Other ways to learn include books
In Cameras

What is an aperture in a camera used for?

The aperture in a camera is used to regulate the amount of light that passes through the lens onto to film at the moment the photograph is taken. The aperture size can be vari

What does the aperture dial do on a camera?

In your lens there is an "aperture" assembly. It adjusts the amount of light that will flow through the lens. Turning the aperture dial sets the size of the hole in the apertu