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The classic Rolleiflex TLR. Higher-end TLRs may have a pop-up magnifying glass to assist the user in focusing the camera. In addition, many have a "sports finder" consisting of a square hole punched in the back of the pop-up hood, and a knock-out in the front.
Sputnik stereo camera. The two lower lenses are used for the photograph, while the third lens is used for composition. A stereo camera is a type of camera with two or more lenses with a separate image sensor or film frame for each lens.