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Coincidence rangefinder
A coincidence rangefinder (stereoscopic, parallax, or split-image rangefinder) is a type of rangefinder that uses mechanical and optical principles to allow an operator to determine the distance to a visible object.
The device consists of a long tube, with two lenses facing forwards at either end, and an operator eyepiece in the center. Two prism wedges which, when aligned result in no deviation of the light, are inserted into the light path of one of the two lenses. By rotating the prisms in opposite directions using a differential gear, a degree of horizontal displacement of the image can be achieved.
==Applications==
Optical rangefinders using this principle, while applicable to several purposes, were widely used for military purposes—determining the range of a target—and for photographic use, determining the distance of a subject to photograph to allow focussing on it. Photographic rangefinders were initially accessories, from which the distance read off could be transferred to the camera's focussing mechanism; later they were built into rangefinder cameras, so that the image was in focus when the images were made to coincide.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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