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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.
Even $2,000 DSLRs have only 3 inch low resolution screens, which are less than one tenth the area of the iPad screen, so you really dont know how good your photo is until you download it later on after the opportunity to take a better shot is gone (the same problem that film cameras had).