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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.
Nikon makes two different types of DSLR camera bodiesâthose that have a built-in focus motor, and those that don't. The cameras that don't have a focus motor built-in need to use a lens that has a focus motor built-in to it. The abbreviation for lenses that incorporate a built-in focus motor is AF-S.