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Photonics Dictionary

stereoscopic rangefinder

A rangefinder similar to a pair of binoculars with a long base, a dot or other wander mark provided in each eyepiece field, together forming an apparent point in space. When one dot is moved laterally, the point in space appears to move toward or away from the observer, and it may be made to coincide accurately with the image of the object being ranged.
 
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