Shutter speed is the time when photo camera fix image while the light passes throughout the lens and exposed at the matrix or film. Shutter speed is measured in the seconds, hours or sometimes the days. Shutter speed length even at one second it should be supposed the long.
The basic shutter speed scale the layed in the line of numbers that ratio 2:1 and in most cameras consists of numbers 8000 (1/8000 sec), 4000 (1/4000 sec), 2000 (1/2000 sec), 1000 (1/1000 sec), 500 (1/500 sec), 250 (1/250 sec), 125 (1/125 sec), 60 (1/60 sec), 30 (1/30 sec), 15 (1/15 swc), 8 (1/8 sec), 4 (1/4 sec), 2 (1/2 sec), 1sec.
Exposure length of 1/8000sec is very short. Such shutter speed used for quikly objects what must be no blured. Most long shutter speed use if necessary capture an image in the poor ilumination. Such exposure used if need be transfer trace of the object for example water or clouds. Also at the photograph is techniqe what called exposure brecketing about I tell you in the next time.
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