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A camera fitted with a mirror that reflects the image of an object or a scene onto a viewing screen so that focus, lighting, and composition may be evaluated.
(Photography) a camera in which the image is composed and focused on a large ground-glass viewfinder screen. In a single-lens reflex the light enters through the camera lens and falls on the film when the viewfinder mirror is retracted. In a twin-lens reflex the light enters through a separate lens and is deflected onto the viewfinder screen
a camera in which the image appears on a ground-glass viewer after being reflected by a mirror or passing through a prism.