In photography, the aperture is arguably the most important parameter of the camera. The aperture is the opening in the camera lens that controls the amount of light that passes through the lens to reach the sensor.
In photography, shutter speed or exposure time is the length of time when the film or digital sensor inside the camera is exposed to light, also when a camera's shutter is open when taking a photograph.
ISO is one of three important settings on your camera that is used to take a well exposed photo. The indication of how sensitive a film was to light.
ISO 100
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ISO 200
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