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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.
SLR stands for single lens reflex. SLR (single lens reflex) refers to the way these camera's work. When a photographer presses the shutter button, a mirror flips out of the way to reveal the sensor.Some people also refer to them as DSLR, with the D being short for digital. One of the main differences between a point and shoot camera and a digital SLR camera is that an SLR has a detachable lens. 2  In other words, you're not limited only to the lens that comes with the camera.