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By using a reticle with marks of a known angular spacing, the principle of similar triangles can be used to find either the distance to objects of known size or the size of objects at a known distance. In either case, the known parameter is used, in conjunction with the angular measurement, to derive the length of the other side.
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 ...
The reticle features a stadiametric rangefinder, ranging out to 400 meters and a single chevron as an aiming point with vertical stadia lines for a windage hold. [ 6 ] The PSO-1M2-1 has also been made in a version for the 7.62×39mm intermediate cartridge, which has the range drum marked for up to 1,000 meters.
A laser rangefinder, also known as a laser telemeter, is a rangefinder that uses a laser beam to determine the distance to an object. The most common form of laser rangefinder operates on the time of flight principle by sending a laser pulse in a narrow beam towards the object and measuring the time taken by the pulse to be reflected off the ...
During World War II the Mark 5 version was developed to function more like a sextant, with a single pivot arm replacing the linear screw worm drive which set the height of the object. The primary benefit of this development was that multiple objects of differing heights could be measured much faster since it removed the slow moving worm drive ...
"This rangefinder has been amazing, I’ve had it for 3 years and never changed the batteries," wrote a recent shopper. "It’s easy to use and consistent as well as an amazing price. If you don ...
Stadia marks on a crosshair while viewing a metric levelling rod.The top mark is at 1.500 m and the lower is at 1.345 m. The difference between the rod readings is 0.155 m, yielding a distance to the rod of 15.5 m.
Reticle of Bell & Howell Pocket Comparator Reticle accessory (PD-8) used in sniper rifles A reticle , or reticule [ 1 ] [ 2 ] also known as a graticule , is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight , spotting scope , theodolite , optical microscope or the screen of an ...