Shutter speed is the Measurement of the time the shutter is open, in seconds or fractions of a second. It is expressed as fractions of a second as 1 s, 1/2 s, 1/4 s … 1/250 s, 1/ 500 s. The faster the shutter speed, the shorter the time the image sensor is exposed to light and less is the exposure assuming rest all settings are same. Increasing shutter speed by one step halves the amount of time the shutter is open and vice verse.
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