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(Redirected from Range-finder)
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, available since the nineteenth century, measure distance using trigonometry (stadiametric rangefinders and parallax, or coincidence rangefinders). They usually use a set of known distances or target sizes to make the measurement.
★ Laser 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, available since the nineteenth century, measure distance using trigonometry (stadiametric rangefinders and parallax, or coincidence rangefinders). They usually use a set of known distances or target sizes to make the measurement.
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See also
★ Laser rangefinder
External links
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