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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.
Rating Newest Oldest. Best Answer: SLR stands for Single Lens Reflex. This dates back to film camera days to a degree. Rather than having a seperate viewfinder, an SLR camera used a mirror system to reflect light to the viewfinder, snapping out of view when you want to expose the frame.In the digital world, you generally have a live preview option, along with an optical viewfinder that was slightly off of the actual lens. D-SLR camera (Digital-SLR) generally lacks a realtime LCD preview, since the mirror is in the way, although newer DSLR cameras do offer the ability to offer the traditional preview like a standard digital.