Technical Note: DSLR cameras have a physical shutter. When you push the shutter button to take an image, the shutter opens and the sensor is exposed to light for the amount of time denoted by the shutter speed setting. When the shutter (door) is open the sensor starts collecting light information from the scene.When the shutter (door) is closed, the sensor does not collect light information from the scene.Think of a camera shutter as a door, inside the camera body, that covers the camera sensor. This is also a factor in determining image brightness. Shutter speed controls the length of time the sensor is exposed to light from the scene. The camera sensor collects & records light information about the scene being photographed. To create an image, light passes through the lens aperture where it’s exposed to the camera sensor.
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