A twin-lens reflex camera (TLR) is a type of camera with two lenses with the same focal length: a viewfinder lens and a taking (or objective) lens, which is usually viewed from above at waist level. In addition to the objective, the viewfinder consists of a 45-degree mirror (the reason for the word reflex in the name), a matte focusing screen at the top of the camera, and a pop-up hood surrounding it.
A twin-lens reflex camera (TLR) is a type of camera with two lenses with the same focal length: a viewfinder lens and a taking (or objective) lens, which is usually viewed from above at waist level. In addition to the objective, the viewfinder consists of a 45-degree mirror (the reason for the word reflex in the name), a matte focusing screen at the top of the camera, and a pop-up hood surrounding it.
Source: Wikipedia "Twin-lens reflex camera" · CC BY-SA 4.0
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