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A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.
Aperture is the term used to describe the amount of light that passes through a camera lens. DSLR lenses have an iris within them, which will open and close to allow certain amounts of light to reach the camera's sensor. The camera's aperture is measured in f-stops.