Aperture TutorialThis introductory tutorial explains the basics of Aperture.


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Posted on 2nd April, 2016

Light. Photography is all about light.


That's where aperture comes in. Aperture is one part of the Exposure Triangle (see our tutorial).


The aperture control regulates the amount of light being allowed to enter the camera and be recorded on it's sensor or film.


Different cameras have different ways of selecting the aperture. A point and shoot camera might have scene modes which take care of it for you. A bigger camera will allow you to select the aperture yourself.


The lens is where the aperture is set. The bigger the aperture (or hole), the more light will be let into the camera. The smaller the aperture, less light will be let in.


Aperture values on a still camera are referred to as f-stops. Incidentally, the f means 'fraction'; the f-stop value is a formula.


This diagram shows aperture values in relation to aperture sizes. They're actually backwards. The smaller the value, the bigger the aperture size. Each full 'stop' either halves or doubles the amount of light let into the camera.Aperture values and sizes

See our tutorial on Depth of Field to see how aperture is related to the amount of the scene which is in focus.


Image: Fotolia.com