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In 1778, Georg Friedrich Brander invented the coincidence rangefinder. Two mirrors set a distance apart horizontally in a long slim box, similar to a subtense bar but located at the measuring station, and forming two images. This rangefinder does not require a measuring rod at the target and could perhaps be considered the first true telemeter.
Mit Kupfern [Georg Friedrich Brander's, member of the Chur-Bavarian Academy of Science and Mechanicus in Augsburg, description of a newly invented rangefinder from a single station for engineers and artillerists, which received the price by the Royal Danish Academy of Science in 1778. With copper engravings.] (in German).
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. It looks similar to a coincidence rangefinder, which uses different principles and has only one eyepiece. German instruments tended to use the stereoscopic ...
The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...
A coincidence rangefinder or coincidence telemeter is a type of rangefinder that uses the principle of triangulation and an optical device to allow an operator to determine the distance to a visible object. There are subtypes split-image telemeter, inverted image, or double-image telemeter with different principles how two images in a single ...
The Argus C3 was a low-priced rangefinder camera mass-produced from 1939 to 1966 by Argus in Ann Arbor, Michigan, United States. The camera sold over 2.2 million units, making it one of the most popular American cameras in history. Due to its shape, size, and weight, it is commonly referred to as "The Brick" by photographers (in Japan its ...