Shutter Speed & Exposure
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When you press your camera’s shutter button, the shutter inside the camera opens for a pre-determined amount of time called the shutter speed. Shutter speed is expressed in seconds or fractions of a second. Most entry level cameras have a maximum shutter speed of 30 seconds and a minimum of 1/4000 of a second.
A longer shutter speed allows more light to reach the sensor and makes the image brighter. By doubling or halving the shutter speed you can double or halve the amount of light that hits the sensor, and this affects the exposure by making the photo darker or brighter.