Scissors telescope
A scissors telescope (also relief telescope ) is a special type of telestereoscope , a binocular telescope in which the two lenses are as far apart as possible due to the scissors or V-shaped construction and a few decimeters above the head of the observer. This makes the image appear more vivid, which enables a better differentiation of distance. With the tubes almost parallel, the telescopic sight serves as a periscope . To avoid blurred images, it is usually placed on a tripod .
Scissors telescopes were often used in the military so that they did not have to go out of cover for observation, and for optical distance measurement via the angle of parallax . Some devices, which are particularly useful for geodetic purposes, can be folded out horizontally so that the two lenses form a meter-long optical base line for more precise distance measurement.
