Any camera is based on the fundamental principle to allow the controlled passage of the light that is hitting the sensor, creating a framed copy of the lens.
Such control is entrusted to a device called a shutter, remains open as long as necessary in relation to available light and the sensitivity of the sensor. The period
aperture is called "shutter speed" and its length is proportional to the amount of light striking the sensor. A double time will give us twice as much light and therefore a more vivid, vice versa for a shutter speed halved.
I will not even a minute on the technique that adopts the sensor, shutter, etc.. whatever the system adopted, when we press the shutter release button, we are controlling the shutter which closes automatically after leaving to spend a short time, calculated from the camera or set manually.
The correct combination of amount of light and shutter speed produces a natural, where the colors and their densities are close to the original visible to the naked eye.
The shutter speed is becoming a key element to control the exposure (the amount of light that reaches the sensor), as well as to capture moving objects.
If we use the pre-selected by the camera this time will tend to use intermediate times that fit in most cases, but that would be unsuitable to capture moving objects.
To capture an object in the middle of the action, you need very quickly. Conversely need a shutter speed longer than the standard to generate indistinct boundaries and trails around the object that moves, so as to create an illusion of speed and color drawings in night pictures.
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