This is an interchangeable lens camera where you see an optical image in the viewfinder showing what the lens sees. They do this using a mirror inside the body that reflects the image seen by the lens up into the viewfinder. When you take a picture, the mirror flips up out of the way so that the image passes through the body to the sensor at the back of the camera. DSLRs work in the same way as SLR (single lens reflex) film cameras, but substitute a digital sensor for the film.
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