Rangefinder
A rangefinder is a device that measures distance from the observer to a target, for the purposes of surveying, determining focus in photography, or accurately aiming a weapon. Some devices use active methods to measure (such as sonar, laser, or radar); others measure distance using trigonometry (stadiametric rangefinders and parallax, or coincidence rangefinders). These methodologies use a set of known information, usually distances or target sizes, to make the measurement, and have been in regular use since the 18th century.
Rangefinders may be used by military or law enforcement snipers for calculating the distance to the target in order to set up a "perfect shot".
A rangefinder camera is a camera fitted with a rangefinder which allows the photographer to measure the distance to the subject and thus take photographs that are in sharp focus.
A rangefinder is a device that measures distance from the observer to a target, for the purposes of surveying, determining focus in photography, or accurately aiming a weapon. Some devices use active methods to measure (such as sonar, laser, or radar); others measure distance using trigonometry (stadiametric rangefinders and parallax, or coincidence rangefinders). These methodologies use a set of known information, usually distances or target sizes, to make the measurement, and have been in regular use since the 18th century.
Rangefinders may be used by military or law enforcement snipers for calculating the distance to the target in order to set up a "perfect shot".
A rangefinder camera is a camera fitted with a rangefinder which allows the photographer to measure the distance to the subject and thus take photographs that are in sharp focus.
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