Today we'll take a quick basic look at Aperture, Shutter Speed and ISO Speed.
Aperture
The aperture determines the amount of light that is allowed into the digital sensor. A small number indicates a large aperture whereas a large number indicates a lower aperture. For example, an aperture of 8 would let in less light than an aperture of 4. Imagine your eye, specifically your pupil; the bigger the pupil is, the more light is being let in and the smaller it is, the less light. This is what is effectively happening with your camera. The aperture also determines the DOF (depth of field).
The numbers you usually see on the side of lenses look l