A shutter speed is how fast a picture can be taken this gives a dramatic effect of either freezing action or blurring motion. Shutter Speeds are also known as exposure time.
Drawbacks
Some lenses can get softer by using high shutter speeds
How and when they are used
So if a shutter speed has been set up to fast then they can capture action completely. If the shutter speed is low then they can blur an image.
This diagram shows us the way that shutter speeds work. So if a shutter speed is 1/1000, 1/500 or 1/250 these give us a fast shutter so that the picture freezes and if the shutter speed is 1/30, 1/15, 1/8, 1/2 then this gives us a blurred effect and the movement in the picture is either just finishing or the shutter speed is too slow.
This shows us that the shutter speed of 1/120 gives us the picture as it has broken down and is a fast shutter speed and the shutter speed of 4/1 is a slow shutter speed and gives us a blurred view of the lights.
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