There are many ways that people discuss photographic exposures, and all of them tend to use analogies. One of the easiest to comprehend is the “window” analogy where an exposure should be thought of as the window on a house. The shutters mounted outside of the window are the same as the shutter in the camera body – controlling how long light enters the window. The window itself can be matched up with the aperture or f/stop setting which controls that actual amount of light entering through the window. The person sitting inside of the window can be viewed as the ISO because they will be able to control how sensitive they are to the light coming in through the shutters and the window. They could put sunglasses on, hold a hand to their eyes, or stare boldly into the light and see the image outside in several different ways.
by BENIPAYO
Write somethin'! Got somethin' to say?