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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.
Pictured below is a battery grip. You've probably seen one before, strapped to the bottom of a DSLR. It's big, bulky, and in the right situation, actually quite handy. The function of a battery grip is in the name itself. It's an accessory that plugs into the bottom of your camera, providing room for an additional battery â and an extra hunk of plastic for the photographer to grip.