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Stereoscopic rangefinder atop the bridge of the German cruiser Admiral Graf Spee Portable stereoscopic rangefinder with binoculars from WWII. A stereoscopic rangefinder or stereoscopic telemeter [1] is an optical device that measures distance from the observer to a target, using the observer's capability of binocular vision.
The position of the lenses A and B are known, and the angle of the lenses α and/or β is set by the operator so that both are aimed at the target. Because the distance between A and B on a coincidence rangefinder is typically fixed, once the angle is set correctly the operator need only read the range from the scale.
The angle of view of a given lens also changes with distance, and the brightline frames in the finders of a few cameras automatically adjust for this as well. In contrast, the viewfinder pathway of an SLR transmits an image directly "through the lens". This eliminates parallax errors at any subject distance, thus allowing for macro photography ...
In 1881, the British Royal Artillery adopted the depression range finder, which had been developed by Captain H.S.S. Watkin for use by coastal artillery. It used the measurement of the angle of depression from the observer, sited on a high vantage point, to the waterline of the target vessel.
A height finder radar is a type of 2-dimensional radar that measures altitude of a target. The operator slews the antenna toward a desired bearing , identifies a target echo at a desired range on the range height indicator display, then bisects the target with a cursor that is scaled to indicate the approximate altitude of the target. [ 7 ]
Miniature Speed Graphic, early 1940s, [1] 2¼ × 3¼ inch format, with focal plane shutter and four different viewfinding means: a spring back with ground glass under a flip-up cover, simple optical viewfinder on top, Kalart rangefinder on side, and sports finder consisting of flip-up wire at lensboard and flip-up peepsight on top
A 50mm right-angle finderscope mounted on a 150mm telescope. Tour guide points out the double Finderscope on the 24.5 inch Cassegrain Telescope at the Goldendale Observatory State Park . A finderscope is an accessory sighting device used in astronomy and stargazing , typically a small auxiliary refracting telescope / monocular mounted ...
A depression position finder measured the range to a distant target (such as a ship) by solving a right triangle in which the short side was the height of the instrument above mean low water; one angle was the constant right angle between the short side and the plane of the ocean, and the second angle was the depression angle from the horizontal of the instrument as it sighted down from a fire ...