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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.
The LCD screen on the reverse of the camera becomes your monitor, your only visual source for focusing and framing shots. FOCUS The auto focus systems found on DSLRs are generally not great for continuous auto focus while shooting video. In comparison to dedicated video cameras, they tend to be inaccurate, and noisy.