Photography is all about controlling the amount of light hitting your film or sensor. You have 3 options to control this amount:
- Aperture: controls the quantity of light entering the camera. It is counter-intuitive, but the smaller the number, the bigger the aperture (f/3.5 will allow more light than f/16, and so on)
- The shutter speed controls for how long the light is hitting your film or sensor
- and last, ISO witch is the sensibility of the film/sensor itself: In the same lighting conditions, aperture and shutter speed staying the same, a higher ISO will result in a brighter image than a smaller one. That's why, at night or in dark conditions photographer use high ISO to compensate the lack of light.
The higher the number, the more sensitive it is. You can use faster shutter speeds and smaller apertures, photograph in lower light conditions. But there's a downside.
The higher the ISO, the rougher the image will look. Digital cameras work best between ISO 100- 400, though some cameras seem to manage it better than others.
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