Simply put, aperture is a hole within a lens, through which light travels into the camera body. It is easier to understand the concept if you just think about our eyes. Every camera that we know of today is designed like human eyes. The cornea in our eyes is like the front element of a lens – it gathers all external light, then bends it and passes it to the iris. Depending on the amount of light, the iris can either expand or shrink, controlling the size of the pupil, which is a hole that lets the light pass further into the eye. The pupil is essentially what we refer to as aperture in photography. The amount of light that enters the retina (which works just like the camera sensor), is limited to the size of the pupil – the larger the pupil, the more light enters the retina.
So, the easiest way to remember aperture, is by associating it with your pupil. Large pupil size equals large aperture, while small pupil size equals small aperture.
Read more: http://worldphotographytips.blogspot.in/p/many-people-think-they-will-improve.htmlPhotography Tutorial & Tips - A detailed Photography Tutorial on "Aperture" with picture samples. This lesson is very basic and important for beginners.
Important Notes:
f/2 = bigger aperture (more light coming in) Perfect for blown up background
f/12 = smaller aperture (less light coming in) Suitable for big groups or landscape photography where you want everything to be sharp.
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