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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 ...
Binoculars: Bushnell sells a wide variety of binoculars and was awarded the Best Buy award from Outdoor Life magazine in 2005 for their Browning Sports Optics binoculars and in 2006 for their Legend binoculars. [22] [23] Microscopes; Telescopes: Bushnell made smaller amateur optical telescopes. Some popular models include the "ARES 5", and the ...
Eyepiece image of a naval rangefinder, showing the displaced image when not yet adjusted for range. The coincidence rangefinder uses a single eyepiece. Light from the target enters the rangefinder through two windows located at either end of the instrument. At either side the incident beam is reflected to the center of the optical bar by a ...
Figure 1: Rangekeeper Coordinate System. The coordinate system has the target as its origin. The y axis value range to the target. US Navy rangekeepers during World War II used a moving coordinate system based on the line of sight (LOS) between the ship firing its gun (known as the "own ship") and the target (known as the "target").
The Bessa-R, introduced in 2000, was a rangefinder camera with a projected frame finder and a Leica screw mount. Although considerably cheaper than a Leica M camera, its viewfinder was comparable in function and feeling. It featured manually selectable frames for 35 mm/90 mm, 50 mm, and 75 mm lenses.
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 ...
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