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What is an Aperture?

In the earlier blogs while discussing Rule of Thirds, or Night Photography we all have come across a few new words like Aperture, Shutter Speed, ISO. Out of these today we are going to discuss about Aperture.

Aperture in very common term is a hole. As a size of hole differs so does the visibility of objects, in Optics/Photography it plays a similar role of Depth of Field. It is denoted by an f no. eg. F 1.8, 2.8, 4.5, 5.6, 7, 10, 13, 16, 22, 32 etc. smaller the number bigger the hole. The best example of an aperture is the pupil of our eye.

Definition: In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.















What is an F/F-Stop Number?
The f-number of an optical system such as a camera lens is the ratio of the system's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. ... It is the reciprocal of the relative aperture.

A lens that has an aperture of f/1.2 or f/1.4 as the maximum aperture is considered to be a fast lens, because it can pass through more light than, for example, a lens with a maximum aperture of f/4.0. That's why lenses with large apertures are better suited for low light photography.

What is an "aperture”? 
Aperture is referred to the lens diaphragm opening inside a photographic lens. The size of the diaphragm opening in a camera lens REGULATES amount of light passes through onto the film/image sensor inside the camera the moment when the shutter curtain in camera opens during an exposure process. If you want to take a picture of a person and have the background be blurry, you'd use shallow depth of field. If you want to take a picture of a sweeping mountain vista, you'd want to use a small aperture size (high f-stop number) so that the entire scene is in sharp focus.


Depth of field is the first of two characteristics that aperture controls, affected by the size of your aperture, the lens you choose, the distance from your subject and the size of your image sensor. The larger your aperture (the lower the f-stop number), the less depth of field you have.

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