Shutter speed is the amount of time the camera's shutter is open in order to control the camera's exposure to the light. Shutter speed is used for catching something in motion. The shutter speed works by setting the time it takes to take the picture so it can be fast as possible or as long as possible depending on what type of picture is trying to be shown. If you are trying to catch something in motion and freeze it, it can be 1/100 or faster and its measured by fractions of a second. If you're trying to create an artistic blur, you would try to have the shutter 1/60 of a second or slower. Basically, the faster the shutter results in a freeze motion shot but the slower the shutter results in a motion blur. Changing the shutter speed causes the light meter to either be underexposed or overexposed therefore you'd have to change the aperture first then the ISO (if needed) to zero out the light meter.
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